Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d6868ba4b1c1b5…

MALICIOUS

PDF

77.4 KB Created: 2021-04-05 17:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3d329bb0b6678f0e3bcb7c49a401c20f SHA-1: 72127afdd9b3c40f8c69bd48924f2210bfa2c804 SHA-256: 41d6868ba4b1c1b579afae3ae7907a1b1b0eab7e5473368e9587ccef4ab34fc2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=ademco+6128+keypad+manual PDF link annotation
    • http://my-favshope.online/steam_chat_logs_localo1vpc.pdfIn PDF document text
    • https://xanovisawedota.weebly.com/uploads/1/3/2/8/132816091/1592585.pdfIn PDF document text
    • https://xuzelete.weebly.com/uploads/1/3/2/6/132681171/famewupikimogifiseb.pdfIn PDF document text
    • https://tumebadov.weebly.com/uploads/1/3/4/8/134863232/sumezegifanit-vexivunemet.pdfIn PDF document text
    • http://jusapp.club/b._ed_exam_formnv7rp.pdfIn PDF document text
    • http://itdiscounts.pro/hd_camera_selfie_beauty_camera138m2.pdfIn PDF document text
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/tovena_fixolawibid_bisolugaririka.pdfIn PDF document text
    • https://bazotopefinuz.weebly.com/uploads/1/3/4/4/134435952/xoketinof.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/8837fd59-4d2d-444c-8660-7ddf617ad12d/yours_forever_chords_kari_jobe.pdfIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_e3deffb33e30455cbf1b7e37da581293.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7edda7dc-e11b-4baa-8cbc-9c3cd3e7a312/dumibedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab562b5e-6675-4eed-a62a-cae36b346bd2/38854214820.pdfIn PDF document text
    • https://8084a2ae-6cfb-493d-8155-0d4219c0f7e3.filesusr.com/ugd/5b3528_7301d3384bd14463a3216f6390073fae.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_37fb5f9a3a694a629f4f303496213597.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_3d84052a646f474fb4708bfd625b82ec.pdf?index=trueIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_26d14e1c50e640c2ba58b3b8d321a85d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76af6f7-8107-43ca-85b2-9958fafd0f2a/95895474215.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_9c05ef18e5b8417489095fb95eaabc24.pdf?index=trueIn 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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 5632 bytes
SHA-256: 06aa8d1e8c5f994c14ca325b41805c3be4b3f85daf9ea7c7c8c3ee984b5b9d82
font_01_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 11412 bytes
SHA-256: 3fda6d0ab4473ca69cea378e823e2575e41c1516b33160a47cb1018ed0285034
font_02_sfnt_off000113a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 16116 bytes
SHA-256: 72496d1700ac634d792cb620a479291a2527a942b42f78b2b16f814dbfded673