Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f7a6209721e45a…

MALICIOUS

PDF

81.0 KB Created: 2021-01-02 06:33:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1d7a8fff032233e8df8cfc5cf3e4e645 SHA-1: a8c50471de5aaef4d0b99d7e0a7e3f788eab4f43 SHA-256: d0f7a6209721e45af71e7f5a21ca44fa5195a35abf2f0dd2998379dc0bad4001
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. The embedded URLs and the nature of the link farm point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/aws?utm_term=atopic+eczema+guidelines+uk PDF link annotation
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/c8a4a4c860.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/jaCjfhb/snow_bros_3_game_free_download_apunkagames.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/JjffBgg/23581113800.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/xutazuwanoforuwoz.pdfIn PDF document text
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/1006910.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/8f47df2e4487d6.pdfIn PDF document text
    • https://danovijo.weebly.com/uploads/1/3/4/7/134774389/xewupupili-dotiture.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/9928676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503987/normal_5fe9b871086d9.pdfIn PDF document text
    • https://keberalu.weebly.com/uploads/1/3/4/7/134725283/b932007c49e51f0.pdfIn PDF document text
    • https://xofebigile.weebly.com/uploads/1/3/0/7/130739964/kijel-zeginexiwim-fibepelorowif-jibamipuwadozov.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/sepovutapakogaf/sir_anticoagulation_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/85314180606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0180ec5-1189-4555-88f4-6003a07382e5/78773828366.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_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 5400 bytes
SHA-256: 8910c25284ed4421b115f6c596cbbdc8df8b8140844573523e9eb3ad7ee3995c
font_01_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 11072 bytes
SHA-256: 229f197a6b5af262479f1a08654a8a5f2ae5bbb7841dfeda9ff2eefa3af659df

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