Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e07a0eab6142e1…

MALICIOUS

PDF

85.2 KB Created: 2021-04-01 09:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 813f22adec2ea568a6556108d8c2e7ca SHA-1: 599bf83eccc2936e1b978bf8642affa161caf0e8 SHA-256: 05e07a0eab6142e1cc4bd314a144f16ddc48d93f576b97ee0ab628762b94cd52
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 0.9997

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://zajinet.ru/wix?keyword=skyrim+conjuration+starter+guide PDF link annotation
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/madawonemedu.pdfIn PDF document text
    • https://sikezenubotimer.weebly.com/uploads/1/3/0/7/130739875/5509383.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/kowexojumanaxoma.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/davawataku.pdfIn PDF document text
    • https://vikakexotokipo.weebly.com/uploads/1/3/0/9/130969200/c3ad02a8.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/ge2oC1H/3280081931.pdfIn PDF document text
    • https://cdn.sqhk.co/ponatabet/IiidUGf/gosiwowatoke.pdfIn PDF document text
    • https://cdn.sqhk.co/bozawenibiwa/aiauWic/smart_and_final_turlock_application.pdfIn PDF document text
    • https://cdn.sqhk.co/konumapedowe/jiiiicV/newegg_business_vs_newegg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_86d24cdbc6d24126933f31f037fae508.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_3c58d2b5af944ef9a67aeead47b8e070.pdf?index=trueIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_cedee201a0054ff9ac3dbd2e7c0d3760.pdf?index=trueIn PDF document text
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_795e69c42e7949dc844f8750dc509006.pdf?index=trueIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_f15d17829e9e4df9a6b540f8fa100338.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_8c89df9d2108432f9ead61065a51bb42.pdf?index=trueIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_69276ed5ed18410a81d2b8bc7177cb83.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_d3c37571014d46ffa8645575c29378f9.pdf?index=trueIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_e84ac7d232ad41d3829710ed8517ea07.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_1ba7bf7f96854a87b3975d88dbd867ab.pdf?index=trueIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_130178b95d6c4d8686ca7619d780f2ee.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_1cf0c36acad946e29cdec27b2e31e520.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_c1fd65a25cf0440eb3907b242b212194.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 5572 bytes
SHA-256: be50c6e323f32e6f9c5b403312273da3a70b5200942ce11f6113c2754b8c72ed
font_01_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 11008 bytes
SHA-256: bc4cadea8a34307612661516d09e57468eba0ad25feee2ce54b8611bb02872c1