Malicious PDF — malware analysis report

Static analysis result for SHA-256 36fd94e0a2d0e4a6…

MALICIOUS

PDF

90.7 KB Created: 2021-04-01 22:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02dfff2e7c53a73ec5766c0b1631f097 SHA-1: d9f9dd11aeceee06c2cac377e9121627a90d68f0 SHA-256: 36fd94e0a2d0e4a638986f4d3b41c409aeed6b656da5c93675e9db4163994670
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cdn-cms.f-static.net/uploads/4497344/normal_5fd6ea80b0518.pdf In PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/kalumugepejefa_bozitufuwezod.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/9634101.pdfIn PDF document text
    • https://nefixesuxu.weebly.com/uploads/1/3/0/9/130969456/penekuluju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5ff97aafa942e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411700/normal_603c816e297c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459028/normal_5fe6fe8376ccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_5fe960474e344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_601399d173594.pdfIn PDF document text
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/2ec123607ab21f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_60362a88292c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_5fd7eec6415f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_60386e6c4f036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473419/normal_6048cfc74aaf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415944/normal_600d118390316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_600f91c6d37e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_6010fda1a930e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=french%20verb%20conjugation%20chart%20fairePDF link annotation
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_2abb9f7a19334ac699a33e8d3651ca4c.pdf?index=trueIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_21b609e82e234bd281d5a21182539638.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_a2f49e87af8a4d589221ae148152d4e2.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_099a31934c234278b15c919fca56ae7a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f04b2bd-7736-4259-ba38-c50a02418b32/side_by_side_book_2_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d41acf-b442-41b1-bd47-92b437280bdf/povapiwaxarepazosew.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013ef7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13EF7 18204 bytes
SHA-256: 9187da318355abbd1ddc8f123930f5545e74e82f3e70630fa0aec30888759670
font_00_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 3312 bytes
SHA-256: c61f2f97bdb998b4f92c7d56673ece40e5494be2cfb8699af240f2eac3936501
font_01_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 5164 bytes
SHA-256: 4337041674f9f169ec5b15db257f04ea1a99f46f51ae0322b895768bff3d82ac
font_02_sfnt_off000116b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 12556 bytes
SHA-256: 39da6fa889cbf7b1aee79f771b373fc128f1ea53e907a5ee03e2add9f82bed95

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