Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd5a3430044e333…

MALICIOUS

PDF

100.1 KB Created: 2021-05-21 20:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2bcf336c005b21dc9c6057893c327cf5 SHA-1: 0afeb06d82a79efcea33e4796200201cf4079c29 SHA-256: 8dd5a3430044e3330e53480b2c45a6ee317494e12b8f49289fc2168166f7b07f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier also strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme.

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://ponafet.ru/strik?utm_term=other+form+of+passive+voice PDF link annotation
    • https://gawotajar.weebly.com/uploads/1/3/4/5/134525297/sodetubawem.pdfIn PDF document text
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/e8c448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411512/normal_6020138819c51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374954/normal_6006a4d604d54.pdfIn PDF document text
    • https://vojutodebol.weebly.com/uploads/1/3/4/0/134096580/790df50bc53c93.pdfIn PDF document text
    • https://sowurudiz.weebly.com/uploads/1/3/1/4/131438308/21364.pdfIn PDF document text
    • https://pinuxutorifepo.weebly.com/uploads/1/3/4/5/134503053/6380247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_600e9cc2ac0a4.pdfIn PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/jurirafiloteje.pdfIn PDF document text
    • https://notagudoda.weebly.com/uploads/1/3/0/7/130776089/sewojipaluwab_nevise.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/fedure/ribaradepinaforelizudeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b39457-9ce5-447d-ac22-21e35fe4ebda/84473108819.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/keporabazafavo.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/90576099554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a559153-eaae-4a31-81a6-8787b40f23bc/wapodudizikabuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd9b239-12a3-46cc-a838-aa4c21a7725e/43931083989.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/fatakugufidifijug.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_off00014638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14638 5308 bytes
SHA-256: 1b3f072d5242ff2303c4c7df66ae445b48807d0391d521519eab3476ecf9fcde
font_01_sfnt_off00015822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15822 12388 bytes
SHA-256: 5a3dd2ebc97eb68de66369e3d7778932be87ce4c6c54017984a9136f0483454c

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