Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d5a4c25c31abb8…

MALICIOUS

PDF

72.1 KB Created: 2020-11-24 04:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94ab7e657300e947dfde8ad27d62b73f SHA-1: 7c16ac121ee05235bb9dd049d1cf356a0c7bc8a9 SHA-256: f6d5a4c25c31abb82bc4cff83f813331cc430546a6daf5d6f31029236ad2f978
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing or link farm attack. It contains a large number of external links, with one prominent URL pointing to 'trafftec.ru'. The PDF structure suggests it's designed to redirect users to numerous other PDF documents, likely to obscure the malicious intent or to serve as a platform for distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://trafftec.ru/aws?utm_term=global+ncap+full+form
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5f944f607a851.pdf
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5fbc460b2ac12.pdf
    • https://dumejolizaxoko.weebly.com/uploads/1/3/0/8/130814858/kenogene_duzasibug_rotalarux.pdf
    • https://cdn-cms.f-static.net/uploads/4475383/normal_5fa729eea0604.pdf
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/levimixalo.pdf
    • https://kepelawurolunuz.weebly.com/uploads/1/3/4/0/134017158/dubapojozub.pdf
    • https://cdn-cms.f-static.net/uploads/4424632/normal_5fa8106048abd.pdf
    • https://cdn-cms.f-static.net/uploads/4426822/normal_5fad2736ef9a9.pdf
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5faa4994901aa.pdf
    • https://cdn-cms.f-static.net/uploads/4426960/normal_5f999c48d62b4.pdf
    • https://darifojiwuz.weebly.com/uploads/1/3/4/5/134588766/e8cbf283a2.pdf
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5fa491dce3419.pdf
    • https://palukenibimel.weebly.com/uploads/1/3/4/4/134401756/garufam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f75da58d-28cb-4217-a6db-1529c7350ed0/nuduvunazopunigaxawawebo.pdf
    • https://uploads.strikinglycdn.com/files/b663c8ca-971f-4486-bab8-5eacc4126d44/novoto.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6f.bin
354755ddbf7628227cc4cb19ac2f22c1729f7873e87666fcbbaf5c2a4f94e88f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 5156 bytes
font_01_sfnt_off0000ede6.bin
f413e35da279f7cd0c59a32cb84faf1f57ca72943463773a55157445f01a3783
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 11232 bytes