Malicious PDF — malware analysis report

Static analysis result for SHA-256 851b80a0cbac9daa…

MALICIOUS

PDF

80.2 KB Created: 2021-03-26 07:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5453be69f30a23cf4adb8400011ced6 SHA-1: 9857d9f3cf4a59c33c569fb83e4c3e47078b3408 SHA-256: 851b80a0cbac9daad6a6043e2bbdf765b625d293ca4592d72e40bc390440888c
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/wix?keyword=animal+jam+arctic+wolf+pet PDF link annotation
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/gajakudo_wizitesot_nujusuvemado_kozebiremolod.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/8188955391.pdfIn PDF document text
    • https://kesuvovim.weebly.com/uploads/1/3/5/3/135317554/c8e2686d305b.pdfIn PDF document text
    • https://nepopuzabigeju.weebly.com/uploads/1/3/4/8/134856357/xitagekilodufijuzola.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/pavuzizesew.pdfIn PDF document text
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/rofebu.pdfIn PDF document text
    • http://muluwusive.22web.org/fuxowamupezixotoxizisujol.pdfIn PDF document text
    • https://riganekonima.weebly.com/uploads/1/3/0/8/130874133/zifokugam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_3ef9474bb51543f283752ac074c2cb4d.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_dfef749fa1e54526902cf04ba6e20355.pdf?index=trueIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_c9ecdfa0967043919e9594ba51eedd44.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_7001a141079344c9a79f6316da5f88d9.pdf?index=trueIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_1c444f5769af4878b0363bdb00e4d99a.pdf?index=trueIn PDF document text
    • http://nogafojomor.onlinewebshop.net/21181154831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b25fa07-18ad-47ad-9ed1-6b91677de254/how_to_use_reader_writer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91b5012-b727-42d2-8680-c972348b68c5/78063982341.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_a3463a5ca8b44fedacefd6efc913b4f1.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_3fdcfd62770c40558127da0815f72f26.pdf?index=trueIn PDF document text
    • http://zitolejix.rf.gd/asphalt_8_free_for_android_phone.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_48a997ac0ba9429a8c8a3a5db352cd28.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 4928 bytes
SHA-256: d5bf184525afe4d4a58582672c2d4675c641ce6f3d922ca93391bcd09bfba385
font_01_sfnt_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 12192 bytes
SHA-256: 8df7b49044abd38143b67afa2418348885c391dc65bffbe722f1616fa42ee6d0
font_02_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378