Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37ecfaf7d6d8706…

MALICIOUS

PDF

73.1 KB Created: 2021-01-14 02:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d6d70de8f178c573bf3efe7e32333017 SHA-1: efe01e597811dbbb1bf28ad34370b113ac861a0a SHA-256: e37ecfaf7d6d870679dafad66e424474eaabe500f0fea2cae77791b94f899330
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many pointing to disposable hosting or redirector infrastructure, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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/123?utm_term=navy+rank+os2 In PDF document text
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/6598072.pdfIn PDF document text
    • https://fofifiso.weebly.com/uploads/1/3/4/6/134613093/ae0258afd6de6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_5fd637fe25a91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374519/normal_5ffc57463e011.pdfIn PDF document text
    • https://nasolebad.weebly.com/uploads/1/3/4/6/134695036/473537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404107/normal_5fbe9d0e18188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409619/normal_5f9fdee138cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5f8d04953dcad.pdfIn PDF document text
    • https://lisopivoxo.weebly.com/uploads/1/3/4/9/134901835/petat.pdfIn PDF document text
    • https://dikabapor.weebly.com/uploads/1/3/4/6/134620412/695fb.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/pulavokaxe/terminabsage_auf_englisch_formulieren.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/salient_features_of_india_s_balance_of_payment.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/fubukibekawulo.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_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 4972 bytes
SHA-256: 963bfe8d01ead5e869881839bccf64479248934af0dfd0a444771b77343b3c95
font_01_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 10736 bytes
SHA-256: abe09be766970296e63c0d125a5285d8422801eab91678c2b32814752ebc22b2

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