Malicious PDF — malware analysis report

Static analysis result for SHA-256 4739060278192089…

MALICIOUS

PDF

71.5 KB Created: 2021-02-05 18:17:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a5f8b3b72852b6df54f6e96e9e907736 SHA-1: 1427f3941a04e620448d051e083a546346f751d7 SHA-256: 47390602781920898e6d951a702e70c62627b7c11f791a77ff32b5cb97e979dc
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 pointing to other PDF files, suggesting a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites.

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://leonvi.ru/123?utm_term=ripley+under+ground+rotten+tomatoes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fffae4291444.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449968/normal_5fe51046a0faf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378855/normal_6007d69853136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464052/normal_5fdee726bcc01.pdfIn PDF document text
    • https://buwipifigidorip.weebly.com/uploads/1/3/0/8/130813409/donativilubu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473954/normal_5ffa2b88a10e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426686/normal_60063f37647dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469128/normal_5fc7a9527783a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_601718fba4aa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426701/normal_5ff7717c63aae.pdfIn PDF document text
    • http://ca-manalapan.space/putikigiwomawegemeh8wux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5fdecd9008901.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481286/normal_5fd0785fe9518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_5fea020843b37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387036/normal_5ffb68a0a9944.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5ff65cbb59681.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 5388 bytes
SHA-256: 365e70ac425e978067ad18f8d28ea45f91f5213d6da03ff4f2fa43a15be5a791
font_01_sfnt_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 10744 bytes
SHA-256: 18d6f2f1ea5fa9a3fa8de68651a297e3d6ac452ef8ac343b56b9351d6cbd35e7

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