Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c7aa18b5321638…

MALICIOUS

PDF

73.9 KB Created: 2021-04-08 01:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8055502a3412f6b54e1d422a7e076962 SHA-1: 5c35df76155a4814098acabd0e9ebfd79369790b SHA-256: 71c7aa18b532163898389aafa6ebe34e5898f01f3ce90dadd9e823191547a2af
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=geometry+and+number+theory PDF link annotation
    • http://mosomupusafebin.medianewsonline.com/tobuvasexujifibukudez.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/how_to_fix_a_broken_stove_knob_shaft.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/bimatoprosta_colirio_bula.pdfIn PDF document text
    • http://logvoz.ru/force_and_laws_of_motion_class_9_ncert_solutionsjbub6.pdfIn PDF document text
    • http://gidilakapajuke.mywebcommunity.org/how_do_you_open_the_graco_snugride_30_stroller.pdfIn PDF document text
    • http://carins.info/5739535031391tud.pdfIn PDF document text
    • http://silvanozito.online/sound_tone_free_downloadxkpd2.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/attack_on_titan_manga_box_set_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_590da06ea5c34bc0af11267e80af88a2.pdf?index=trueIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_02d5f725930442aba96cd481c8b8b9fe.pdf?index=trueIn PDF document text
    • http://zilowovuv.atwebpages.com/nadawesofivun.pdfIn PDF document text
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_47dbf17554ec47d0b9700c0ce6b432d7.pdf?index=trueIn PDF document text
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_4f7c72d07d4141b48ec94cdd77725cd2.pdf?index=trueIn PDF document text
    • http://moxuzaridob.onlinewebshop.net/kubuzipitix.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_47f1c78ee74c4c21ae409f72aed9df00.pdf?index=trueIn PDF document text
    • http://vizozaforuf.atwebpages.com/effects_of_water_pollution_file.pdfIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_2c0d6dcf55e742a8bf018054f8de7aed.pdf?index=trueIn PDF document text
    • https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_f0eb302c60154a1fbfc32285811e69db.pdf?index=trueIn PDF document text
    • http://padusij.onlinewebshop.net/749308872.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
    • 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_off0000ce29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 5128 bytes
SHA-256: 56a33a9b39c314cbb6662bd574304fd83f8e7b3edf597cd189df580dffe20bfa
font_01_sfnt_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 11048 bytes
SHA-256: e483fa49d01cbaff100749a0ace35310807a2c63f3ff1a80ae0370ca51011229
font_02_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 16088 bytes
SHA-256: 5f26caebf9be23218f5d346afd9088fa63177b9919c3dd01a3c435c5c1e51257