Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e2dee02298f73f…

MALICIOUS

PDF

116.2 KB Created: 2021-05-26 04:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 254818cc872a65539f530788874940a1 SHA-1: 2dc18c254a8f2dd5e14f7a3e5b6258205f711e79 SHA-256: 81e2dee02298f73f3602c724dce8547269f6da91cef4aa299ba3274afb8b269a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. The embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=exponential+function+word+problems+worksheet+with+answers PDF link annotation
    • https://rorujazikuje.weebly.com/uploads/1/3/1/3/131379225/4bee603d.pdfIn PDF document text
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/pelote_gapigipowe_jimosore.pdfIn PDF document text
    • https://falojabuvo.weebly.com/uploads/1/3/4/7/134774067/nagepaneme_lifelovajibetot_fojaji_dikuxejuzoju.pdfIn PDF document text
    • https://nekatiru.weebly.com/uploads/1/3/2/6/132695473/dajudadu-tarazavaf.pdfIn PDF document text
    • https://lenukadizavubo.weebly.com/uploads/1/3/4/4/134492519/laguzelukezuzajewoz.pdfIn PDF document text
    • https://pobifixakije.weebly.com/uploads/1/3/4/4/134445477/nopiroge-fenakoduv.pdfIn PDF document text
    • https://gokavebaraxev.weebly.com/uploads/1/3/5/3/135309677/5b570674037.pdfIn PDF document text
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/335c9b7c.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/200851.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/229622.pdfIn PDF document text
    • https://dunexagog.weebly.com/uploads/1/3/5/3/135303431/2c2657c65a1c9c3.pdfIn PDF document text
    • https://tataberoxem.weebly.com/uploads/1/3/0/8/130874397/vonununotezisetuna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/630e5a7b-536c-4b71-9cc9-e6b695956996/2125206290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79dc2b9-753f-4367-a468-e1224d1cd12d/12835528530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8753635b-99d9-4007-bf5e-cbb0adf8a895/tubegekodalotumososaxosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc014a2-cd3b-4977-ad0a-237ad9803f3c/cobra_29_lx_max_antenna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734b11ad-f475-40c6-891c-0d8f64a0c1e7/what_is_lean_6_sigma_yellow_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9689fa2a-4091-4d97-b2ea-ba473c9949b0/bewesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a768ca59-c8dc-43c4-929c-7f113ee4c666/bamilerukuzifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/392bef82-d78c-4c2f-8eee-242b319dd4fb/short_odia_moral_stories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0df016-cafd-460d-9393-ade2094ea079/33768330237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ae4192-3b0a-4668-b3c9-5faaf100b993/vibukefipunidep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff4e345-96ab-4318-8db4-9a26f940997f/does_directv_have_a_music_video_channel.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12705 6632 bytes
SHA-256: 62a33ce998837356dbbb7f780a9b0b83015d38f11937f30527e87fb24b55f554
font_01_sfnt_off0001376f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376F 4960 bytes
SHA-256: fc263a7945ae9c80f1e221953fd7aa79aaadf6b451718927ec2c49a87d7a0b09
font_02_sfnt_off0001489e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489E 5716 bytes
SHA-256: 6d440d4b7751997bc58041cbbfdb6ce1212380588b88de54b3fc0ea1d84cd062
font_03_sfnt_off00015c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C02 17060 bytes
SHA-256: 7945fabcad6af3a5d86f559ad4943228bc5c63274426cd2e46d1ec1885e609cc
font_04_sfnt_off0001948e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1948E 17908 bytes
SHA-256: e7ad66e8d082bfd6c51a8d6572b01e993c727c1b3cece6f025be10eba3ceed7d
font_05_sfnt_off0001b03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B03F 6116 bytes
SHA-256: 1041cd5f72aa2a91e0b19d9d95e77837e3588b3751c6c7ef2c18a93a8ee0cf4c

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