Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7d6eb4ac7a4fe6…

MALICIOUS

PDF

65.4 KB Created: 2021-10-06 03:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 31d40f1b1f6b83f531ace4289ca99c97 SHA-1: b94a2cdbc45f1e68e88371bc9f8768245c3f4786 SHA-256: bc7d6eb4ac7a4fe60f28fcfb63e9af7d4a7c9b7beee4ae568394cfc1c9e931d9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

Heuristics 4

  • 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 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://cplastik.eu/data/cms/file/setevisaza.pdf In PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/44600320165.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/luguwumigelovoligol.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-26/20210926235956331519.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/mejotonijod.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/3335989714.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/59325339207.pdfIn PDF document text
    • http://osayit.com/images/file/69455239049.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/52034931007.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/16879831750.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/kelejupo.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/43595147814.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/38474481330.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/niwuvimarifevamiwemut.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/37028959331.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/konodigibu.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/44364531859.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/69409461622.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/tenititegumiven.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/dovatorepex.pdfIn PDF document text
    • http://szwygs.com/upload/13430043072.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/jagemezi.pdfIn PDF document text
    • http://it-hair.com/userfiles/zimege.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/pumopelurajizudaxod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=malar+cash+and+carryPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 20192 bytes
SHA-256: ad08a1f10326e0c1eb94fa3a9280f140dffe99651f4f179d5dfe79df35f87274

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