Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd35c48e82da6d9…

MALICIOUS

PDF

85.9 KB Created: 2021-03-25 15:36:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca260ba3e7417ceff2c9713a43c72d80 SHA-1: d2ca06145613510c612306cd2167df368ba4d3e6 SHA-256: 3fd35c48e82da6d9b967ee768eb3a4c0df1b7add1bde78f9e9dc83f2cc646193
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8028

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/award?keyword=mathematical+modelling+problems+pdf
    • https://cdn-cms.f-static.net/uploads/4465142/normal_604228eec24b3.pdf
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/fogevamegilo.pdf
    • https://static.s123-cdn-static.com/uploads/4489609/normal_5fca7ca093431.pdf
    • http://noncomform.space/60212071422q3253.pdf
    • https://cdn-cms.f-static.net/uploads/4407994/normal_60539a5870556.pdf
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5fcca2add8f34.pdf
    • https://cdn-cms.f-static.net/uploads/4470409/normal_605b3787644d5.pdf
    • https://static.s123-cdn-static.com/uploads/4408323/normal_6000451e94766.pdf
    • http://sweetmeet.online/press_your_luck_host_elizabeth_banks2iqur.pdf
    • http://wordsidepost.top/oster_bread_machine_recipes_5838xhfol.pdf
    • https://xumagatovonag.weebly.com/uploads/1/3/5/3/135312495/55572.pdf
    • https://cdn-cms.f-static.net/uploads/4459025/normal_604ec15a455af.pdf
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5fd98e9be6c06.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mejigavukolu/zimisexigobo.pdf
    • https://s3.amazonaws.com/jedaxopopuko/85826404950.pdf
    • https://s3.amazonaws.com/nijudow/7081372937.pdf
    • https://s3.amazonaws.com/gumegulaxi/zunewaxoxo.pdf
    • https://s3.amazonaws.com/xisakazelelinim/operations_research_jobs_in_bangalore.pdf
    • https://s3.amazonaws.com/vunizi/gowew.pdf
    • https://s3.amazonaws.com/bezorito/55029854293.pdf
    • https://s3.amazonaws.com/dikobepibelun/porter_cable_dovetail_jig_4216_video.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124f2.bin
69b6fa65c0f2dfa46f51e2a5c2b548ad5ae107cf651f541e8e8bfaeb9c6b6ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 5716 bytes

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