Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a19d986e7ac9290…

MALICIOUS

PDF

74.7 KB Created: 2021-01-06 02:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 431c64865e0731ec62361fd89c2eb0f0 SHA-1: ef1350330cd4e783971c7926aab384c852eeb441 SHA-256: 8a19d986e7ac9290c4a83c99a0d865dfa1f2ad89b127c4991787eaf4de02ca11
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one key URL points to 'trafffi.ru', suggesting a link farm or redirection service. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=the+magicians+trilogy+age+rating PDF link annotation
    • https://cdn.sqhk.co/gabamulijawe/fOig3ji/angry_crab_shack_phoenix_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/divekezor/s7giZ9l/lujadewamipisaripi.pdfIn PDF document text
    • https://midepixa.weebly.com/uploads/1/3/4/6/134622545/pizeli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/mla_style_guide_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c42fec-5331-4c01-b6fb-8dee22020fd8/apostila_biologia_bernoulli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84e96bf-6438-43ac-bb26-37480d32f520/livatugusabonujutunap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9868d20-28fb-4fd1-ad5b-93b73303a198/brain_training_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/digital_citizenship_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea913d8-ff81-43cb-b711-18ccd4b2faf7/gopukasokilip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d789d3b-76da-4e65-ac16-42533772b707/80560988667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f769e8-aea8-4340-9b81-4f44b323c8ca/dasuwamuzibikulizav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c9a48e-6677-4de7-9c83-f37eb4b0d876/lajuzavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf06c48-8e81-4350-a65f-adaccd398362/23523727736.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_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 5264 bytes
SHA-256: 90c5da48f13e5e5f758cf30ba582db37e216e1ef875434472b0668a11c5064c8
font_01_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 11048 bytes
SHA-256: 65e1dd2a77fec425f27fe375a3e95360a2ee597ab27b650e861882e708448d90

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