Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3eb015136f82ce…

MALICIOUS

PDF

76.1 KB Created: 2021-02-02 17:21:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 98b1d0c84ddf1091869fac9d0018541d SHA-1: e467da30754df0de94c1783e8237b85149574290 SHA-256: eb3eb015136f82ce893e5ede63bf2b0d4cbf05d8d83329a7b2efeda870bd2a45
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for SEO manipulation or phishing. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document, potentially leveraging embedded JavaScript for redirection or other malicious actions.

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://seumenha.ru/aws?utm_term=xml+formatter+nodejs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487641/normal_5fccd88aa7dd7.pdfIn PDF document text
    • https://kibewuzogoluwiw.weebly.com/uploads/1/3/1/6/131636689/8813355.pdfIn PDF document text
    • https://sepafolelobonel.weebly.com/uploads/1/3/4/6/134614676/ede475af964d0.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/iihjhca/psoriasis_treatment_algorithm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366367/normal_5fc63e79591b8.pdfIn PDF document text
    • https://cdn.sqhk.co/gidowoji/KhjdieK/topenuraxeg.pdfIn PDF document text
    • https://sanajupa.weebly.com/uploads/1/3/1/4/131406847/lutasufifawo.pdfIn PDF document text
    • https://nililekekikare.weebly.com/uploads/1/3/0/7/130739967/7cd705cb2dd5f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5fe621aada64d.pdfIn PDF document text
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/jalebipapibiw_sikaz_monimog.pdfIn PDF document text
    • https://bitojeromewex.weebly.com/uploads/1/3/0/8/130874526/da853b.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/id1jcja/81073567754.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/hdafEgc/surf_shack_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387918/normal_60074cc519690.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/235091bd86ba8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 5108 bytes
SHA-256: 999506e945e2be14f8de7c2d5984bb83a1a5ef8f00f478c5eece75e58ca989cc
font_01_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 6520 bytes
SHA-256: 32358e11195b7bc74dc69b1ec77337797b27d2319967fb2d51345f7f977fbe63
font_02_sfnt_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 11352 bytes
SHA-256: 7b9e23cfe6674040e190a58e04c2e571d1c20d323d3dcb527cfed336c689a63d

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