Malicious PDF — malware analysis report

Static analysis result for SHA-256 5797b58a41f9b10e…

MALICIOUS

PDF

80.8 KB Created: 2020-11-18 11:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a0f87f99f1d83e04ede47887c14191d SHA-1: 181eef36017be27f8fb146708ddeaef7e2c796d9 SHA-256: 5797b58a41f9b10eb417bc7da89f092f66d7f0078438670ea4093fb87562fa9b
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=culturally+sustaining+pedagogy+examples
    • https://xufibafit.weebly.com/uploads/1/3/4/4/134403857/2355410.pdf
    • https://bedakowunuva.weebly.com/uploads/1/3/4/3/134342711/povixugoruja_rijojagipejozer.pdf
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/1589806.pdf
    • https://zapilututok.weebly.com/uploads/1/3/4/3/134341349/delukozelemis.pdf
    • https://kofusozefo.weebly.com/uploads/1/3/4/5/134515267/f0942d37979.pdf
    • https://cdn-cms.f-static.net/uploads/4416791/normal_5faa30aa577c6.pdf
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/871187.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b0fb39db-4941-4ec2-81b6-9c78b5fabefc/53758460631.pdf
    • https://uploads.strikinglycdn.com/files/8d954ece-ffd9-44a0-a4b6-7495173c0a8b/livugixifuxo.pdf
    • https://uploads.strikinglycdn.com/files/067ac0e4-a51f-4a7a-af00-172add3edf1c/jivupunagufetasuwo.pdf
    • https://uploads.strikinglycdn.com/files/5279bc50-a6b9-42cd-a081-f6337ab8ce81/72762631480.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e52d.bin
3e2434818ce07107d45845c3816e57c8f4184dc97287ab7c8a213b9922bb1a67
pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 5352 bytes
font_01_sfnt_off0000f756.bin
965cbdb323226b8b7a64b88e5894b80ecb8fda07ddc66825744af38318f96365
pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 10980 bytes
font_02_sfnt_off00011c95.bin
88bd7c36fae65213bd3403454b8779c592da4c70596afc98f9e375c41c7e983d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 17468 bytes