Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6a594cedaa1df7…

MALICIOUS

PDF

96.6 KB Created: 2021-01-07 20:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6ce2042a3021f53ce5bd34d641fbedad SHA-1: 9839f05ee130e1635fecdddeefc3ff45bc55d961 SHA-256: 9c6a594cedaa1df7f20bf5a68b1c6c0fc6b0220c06bf0040417155f9b02e911e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified as a redirector at 'traffmen.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristic firings point to a phishing lure disguised as a CV sample.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=professional+cv+sample+word+format In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5f92a5334e6e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_5fb308f95a5e2.pdfIn PDF document text
    • https://wigikezidewuti.weebly.com/uploads/1/3/4/5/134578964/2035395.pdfIn PDF document text
    • https://bekogome.weebly.com/uploads/1/3/1/4/131454098/8163807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422145/normal_5f9912328e3f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369927/normal_5fe3077e2196c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501770/normal_5fdcba1f60ee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_5fb849f460f89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/396c7e5b-ce7c-4d7e-8169-cbb7ec349ff2/71093964565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a2db8a-3803-41e3-a780-3dcf7d757a77/43959376185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6baafa8-0b59-413b-a85f-62dcba7d8b45/kibuwiwipuwenima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/631de967-6239-4412-8f0c-3880d7db102f/zovewog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7ef004-91c2-4232-a169-600b09da6dbd/bufowanav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf40e1c-7395-4402-ae9d-080bb25b32f5/92834699344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a9d834-4abb-42a0-9566-b63883567284/sijekupegeg.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_off00013e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E39 5452 bytes
SHA-256: 22502b0dd3b725a044940ab925548c0293270d514f15e093e8da30b7b21207b4
font_01_sfnt_off000150c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C7 10860 bytes
SHA-256: ecc53660b29581886c30b7edba7bbe69a082ce146ca7da62caf2b626d34c5085

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