Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc838c8047e26df8…

MALICIOUS

PDF

62.7 KB Created: 2021-03-02 02:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 11cdeb6c843a23cb0079b4e910d7e7a8 SHA-1: 57497024c64d9d9ed1939ea8423114f6e6ef74f4 SHA-256: dc838c8047e26df83b2380582e41387d544fa8c8162db7d6f9da673cc6beefa0
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic. The primary URL points to a keyword-rich page likely designed to attract search engine traffic and lead users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9023

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
  • 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.
  • 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://vilenefex.ru/award?keyword=hp+officejet+pro+8610+printhead+cleaning+kit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465262/normal_5fc77a6b5bd83.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/geHjf8t/62842401584.pdfIn PDF document text
    • http://golomashvanna.xyz/vokazpfiq6.pdfIn PDF document text
    • https://lagipadule.weebly.com/uploads/1/3/5/3/135301279/0d48125d520ed2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_601e109f5b919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_6012286389029.pdfIn PDF document text
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/sabajukuperajat_telejixojofasu_tigolabori_mozawejew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_6022a62a979cb.pdfIn PDF document text
    • http://kigurumi.org/how_to_change_my_voicemail_password_on_androidqc7w3.pdfIn PDF document text
    • http://dfwshootersupply.com/re_zero_light_novel_volume_11emw6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485591/normal_6000a46157c34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450427/normal_600626d5d38f5.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/EhhguB3/pisabuserixexibipuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5fe8912fc3aa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412165/normal_5fd0d4754f342.pdfIn PDF document text
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/rabugukifaruk_famukob_wevife.pdfIn PDF document text
    • https://tufubigin.weebly.com/uploads/1/3/1/4/131453284/kenotipova-duragixazufojaj-riwasovegu.pdfIn PDF document text
    • http://ueuniti.xyz/demolition_derby_2020_texastpkd4.pdfIn PDF document text
    • https://vozosirebuvova.weebly.com/uploads/1/3/1/3/131382942/6799fed59695e77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444869/normal_602aeace52ecc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 5880 bytes
SHA-256: 1d542e533f56bbc7469ed7f754875eae81238231d659de9b353542bf74cdf7ae

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