Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ed3d48f541b3de…

MALICIOUS

PDF

77.5 KB Created: 2020-11-13 20:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dfad4c04114cfe85692d91f1c813b8eb SHA-1: 106e6253d30752ecb31cd73c205ae946f084d766 SHA-256: e4ed3d48f541b3de6d04fbc35f08c32a9b1d2e57442219cd59bcaa048c3734c3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one heuristic specifically identifying a 'mass external PDF link farm'. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary IOC is the suspicious URL 'https://trafficel.ru/aws?utm_term=iclei+usa+2009+annual+report', which is likely part of a phishing or malware distribution 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://trafficel.ru/aws?utm_term=iclei+usa+2009+annual+report PDF link annotation
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/e716122723ddb0.pdfIn PDF document text
    • https://siropenisawad.weebly.com/uploads/1/3/4/3/134353493/387f372300af.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/daselex/mukaruweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ec9b05-dc95-4136-adf2-39ddbc4cf2f7/48809303171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd33ed9-268c-4430-ac4e-595873590aec/kijuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6773650-28d8-4eab-a1f4-fd74fa482350/45128553669.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/pathfinder_2e_wizard_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b145bdfd-e8b1-4068-8139-6ebbf75af2aa/clasificacion_de_cuentas_contables_guatemala.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/87848926718.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/diesel_fuel_for_life_cologne_50ml.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15cee314-077a-41e5-bdf0-3db099904e2c/40577701074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93d3303-e590-40a9-8f10-8a5ce7b5053b/nozenabud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd0d979a-5298-4dfc-85ef-019e07c55c05/kujutukewexakilubosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1d514a-4fc5-4780-9770-5e5c738d042b/22826684973.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_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 5292 bytes
SHA-256: 82778b4ceb1b2a661ed06a36bd4a1a933f26f337f23d31480616ac68f521b21e
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 11176 bytes
SHA-256: a5bc0d0ce712333b73d357e6fe48f8dedc96bcd5282e26cef810cf94852b9a1e

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