Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b074b2e01e3387…

MALICIOUS

PDF

66.3 KB Created: 2020-11-25 17:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8fb4377262fe712c332734401651ee2b SHA-1: 8c5af8b0ddb16d336cb11973e789565b39f865fa SHA-256: a3b074b2e01e338778a11ff422d3316361070c7c1209ed9d3bad37aee79d8cc6
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains embedded links, one of which, 'https://traffmen.ru/strik?utm_term=operative+parts+of+a+deed', is identified as a malicious redirector. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to trick the user into clicking the malicious link, likely as part of a broader phishing 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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/strik?utm_term=operative+parts+of+a+deed In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_5f95e34bcae8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5fb2b4448273d.pdfIn PDF document text
    • https://jisuzinux.weebly.com/uploads/1/3/4/6/134671095/89384962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5f9b1ab877880.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/26ea10a5fcf02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504047/normal_5fb9f426a8678.pdfIn PDF document text
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/waxoz_xevujop_fasalotijipejeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5fb2b876483b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8730e4c54bc.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/a41d8587-5e23-4a01-9f26-e51c060d761a/83241390406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3dcffbc-425b-40a5-914e-990e40200201/11913514063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53fe49a-f982-40b8-8e52-d59e64df84a4/wanokonalol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306d0e15-e1f7-469e-b102-3267ba5cf12e/27113980976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b87436-c94b-4e7f-a568-472f53965778/plasma_blast_2_unblocked_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff7bcec-85f6-44a8-b982-5b5fc2256e4f/69508804015.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_off0000ca01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA01 5088 bytes
SHA-256: 48d7651231fe5fc8fe58462aefb5554df31b75f16dad354c8b8a6bf7c9acd609
font_01_sfnt_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 9812 bytes
SHA-256: 446ecdeb0d5cc8b3cb4f5b626f0e85bac5780e600ea1ee8c813d804bf6520e1c

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