Malicious PDF — malware analysis report

Static analysis result for SHA-256 e909fa6d0cce1fdc…

MALICIOUS

PDF

79.3 KB Created: 2021-03-16 13:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 55da2850f210e03d1e7401a898971026 SHA-1: 11f3d7d1e7fe2829153ba9ddd0d6319f374405cd SHA-256: e909fa6d0cce1fdcd232896554379d72318593e3715fee3ae5e75d0d5f039c21
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://soxebez.ru/wix?keyword=estatua+del+cid+campeador+en+burgos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459182/normal_5fdbde4d484a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_60002aa20b944.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421640/normal_5fef0cc0556e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_60301acd8eaaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_602542e7656cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_60133ef810f67.pdfIn PDF document text
    • http://fewiliw.22web.org/73340387276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475985/normal_600e0bfaafe0f.pdfIn PDF document text
    • https://rumarefux.weebly.com/uploads/1/3/1/0/131070750/2519560.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5ff5750913001.pdfIn PDF document text
    • https://tilinonulubun.weebly.com/uploads/1/3/4/6/134614078/7666329.pdfIn PDF document text
    • http://maxufadewodov.22web.org/rivodar.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/7bf46374-24d3-4543-876f-cd091ddb1c31/ms_project_mac_os_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96806821-e411-45c2-b6cf-9f51bc040b71/does_everyone_have_to_get_a_real_id_drivers_license.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_eb8639aa802c452a979ba284861261cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c35cd8-16fe-4294-8567-59015def7d07/c_for_game_programmers_book.pdfIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_35640735df8946b0ab95f4ddb272d8a1.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_7295cbae8b0448298ac177937532b243.pdf?index=trueIn PDF document text
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_c94122627cd5491f979856d7bf47127c.pdf?index=trueIn PDF document text
    • http://direpedokelazal.rf.gd/82288329023.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_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 5492 bytes
SHA-256: 934ba102764224c62bb70c74dd243f58abe9e88cb1e16ba814fcee4e1b89b54f
font_01_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 13112 bytes
SHA-256: ed23f6728d9c4f10d554b89f5700f053a6fb4b4f568e091e80146db480ca7b0c

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