Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a280c1c2026235…

MALICIOUS

PDF

99.3 KB Created: 2021-06-09 18:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebf4d77e856be6ca4d4f3ed77846d356 SHA-1: e325f7eb1e23d386cc473a45bbf815054b145093 SHA-256: 90a280c1c2026235c79c3d834db6ec5de36af7ebcd436240544a8a90689c9bf6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links, https://pixomot.ru/pbw?utm_term=beloved+morrison+pdf, is directly associated with the malicious verdict. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/pbw?utm_term=beloved+morrison+pdf
    • https://cdn-cms.f-static.net/uploads/4474206/normal_60b7e69256045.pdf
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/7999969.pdf
    • https://cdn-cms.f-static.net/uploads/4464539/normal_606475d224932.pdf
    • https://cdn-cms.f-static.net/uploads/4445726/normal_601a88999017c.pdf
    • https://zidevikab.weebly.com/uploads/1/3/4/5/134576262/nulabexes.pdf
    • https://static.s123-cdn-static.com/uploads/4427085/normal_600969e8a3594.pdf
    • https://cdn-cms.f-static.net/uploads/4454550/normal_602080f02281a.pdf
    • https://cdn-cms.f-static.net/uploads/4423133/normal_5fd16f7903b14.pdf
    • https://cdn-cms.f-static.net/uploads/4388839/normal_601dafc164e52.pdf
    • https://cdn-cms.f-static.net/uploads/4385636/normal_600a1264d63fc.pdf
    • https://cdn-cms.f-static.net/uploads/4377120/normal_60399c0b1fdc1.pdf
    • https://cdn-cms.f-static.net/uploads/4379048/normal_6050d47422592.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bed1720a-86a4-4175-9f95-8c625123b400/how_many_horsepower_is_a_4.3_mercruiser.pdf
    • https://uploads.strikinglycdn.com/files/0e36513a-395a-4f2c-81ff-84bd40e80091/20970379327.pdf
    • https://uploads.strikinglycdn.com/files/d29a2638-e3f8-4328-9eab-c6765242e28a/denotation_and_connotation_examples.pdf
    • https://uploads.strikinglycdn.com/files/b45d28fe-7b06-4a63-ac0c-2902917afb81/debef.pdf
    • https://uploads.strikinglycdn.com/files/4e6e7a4c-0052-4f65-9546-af7b56e954bf/sotukisoxuvusupo.pdf
    • http://pagorevet.pbworks.com/w/file/fetch/144808017/35639512773.pdf
    • http://kepigiwup.pbworks.com/w/file/fetch/144751839/wexow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147d4.bin
3270990f41a9208712ea12932ae47df556269f76fede4a33c887d91270157b73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147D4 5088 bytes
font_01_sfnt_off00015915.bin
417910ae3bcd971ca7d753886b6c67f88509ccf4594e49f42165235fe39c2220		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15915 11760 bytes

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