Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f6c6a3aba969d4…

MALICIOUS

PDF

74.8 KB Created: 2021-01-05 23:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 405633911056b7d6d770147d2961407e SHA-1: 7a09be6307ef9c80a191b3d6a67d52ffb49e3ef8 SHA-256: c4f6c6a3aba969d48f1a85bf9f95b63ca1d0bd981b84d6f77979ee06a1779764
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs and the PDF structure itself points towards a phishing or link-farming attack pattern.

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://trafficel.ru/123?utm_term=katawa+shoujo+story+tree PDF link annotation
    • https://cdn.sqhk.co/lojiwoxaz/gBEtRje/ocotillo_wells_rentals_dirt_bike.pdfIn PDF document text
    • https://cdn.sqhk.co/govovazeket/gjb6xia/icici_mobile_recharge_coupon_code.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5fc6f14354d78.pdfIn PDF document text
    • https://burigazipe.weebly.com/uploads/1/3/4/7/134764527/kemidefinakis-denutuxumod-lemomuto-kufirapakezan.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/4235290.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/iaFYTif/vasakifufezob.pdfIn PDF document text
    • https://nexuragero.weebly.com/uploads/1/3/4/7/134751893/9975426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5f9a3354889f1.pdfIn PDF document text
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/tafunaxasujides_toxozanewala.pdfIn PDF document text
    • https://vabikepopuf.weebly.com/uploads/1/3/2/3/132303012/8264005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fc336d2b9782.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/juvetaso/58302338195.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/doserisomikojebufujak.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/the_pact_jodi_picoult_free.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/alfred_marshall_principles_of_economics_book.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_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 4980 bytes
SHA-256: cdb28903543f16aa518cb325b1a582441b9a478a44f1bb853016f3f8c3427579
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 10624 bytes
SHA-256: cfb2e31a541f292e97c11d1e8bfc8caedc24f550680dca302c159879c17ed506

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