Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2d421bab08a10f…

MALICIOUS

PDF

74.5 KB Created: 2021-06-07 23:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 95925f75ad09c757f69f46fea910f319 SHA-1: 2fd0f57cbb33f41409501342659cb374e810ee1b SHA-256: 8b2d421bab08a10fff3143f7d2ba2d807cb16725f3bf0cacc6d1861188b7e6f0
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://seumenha.ru/123?utm_term=spider+man+movie+collection+in+tamil PDF link annotation
    • https://danulezide.weebly.com/uploads/1/3/4/6/134601395/lutalosalewijiz.pdfIn PDF document text
    • https://zanokelalugabu.weebly.com/uploads/1/3/5/3/135315143/e5284de7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5ff8a27d15cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480891/normal_6015c850c7eae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5fd076541e180.pdfIn PDF document text
    • https://pubigomusukuma.weebly.com/uploads/1/3/4/5/134511275/zazizisolerudoxenelu.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/wogafagovafuvel_rotumakal_lifirivumupig.pdfIn PDF document text
    • https://rozapalevode.weebly.com/uploads/1/3/4/7/134705228/zetisanurewola-tikexobum-widodepinik-zileje.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/76bac9c8-7c0d-455a-a680-7754df4e5425/zejizorizebozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1655d2f2-b9d9-4dfb-84b1-c6f30ca0ebcd/11167145984.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/fufubelupokoworijulemuv.pdfIn PDF document text
    • http://vadibun.pbworks.com/f/80234284943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b05e9eb9-bca3-4963-918e-bed7840f3dfb/38947330015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d996b4-5f31-4031-b556-f2130776e581/loluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8a8ce7-1a57-4c6c-aad7-4d46f94598e7/rusaverakelipeziwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0fd510-60de-414f-820c-71127f78050b/nisam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867943c6-7502-4cec-b1c4-4bf7ea162c3f/arizona_driver_license_manual_book_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa215b8c-94ad-4a65-b107-3591ff2b9690/human_geography_textbook_answers.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144471537/39538488178.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 5204 bytes
SHA-256: 84314da5887c4e1340599becfedfc557a236ee2d2ae8437a6b255811a1d2bc27
font_01_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 11724 bytes
SHA-256: 4d703b1356193b5ea4751cd31cc2e869bd7b2fb8e0ab229d225fb9062f0d86bb