Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7977ba82a3afe4…

MALICIOUS

PDF

126.4 KB Created: 2020-11-18 08:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 67c77fc75227f4f3dc9e1e88782991ea SHA-1: 0bdd32e214f730041f1e2bf1151075df4b8807f3 SHA-256: 4c7977ba82a3afe4f2d678faea9211109900ba910450c41ca52b28de2ff83e00
212 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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
  • 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.
  • 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://cctraff.ru/aws?utm_term=calorimetry+pogil+packet+answers In PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/voninajekagefumazis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f8f43c76035d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f8bc01321a55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_5fa093d4706ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f964ebded06c.pdfIn PDF document text
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/sofasibizilag_kavilatezejod_nexij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413111/normal_5fa8730d5628d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f9b6f3026f12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d62951e-86d5-4967-abd4-995946efc7e4/50425538537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e8ac4a-64a9-4e02-932e-3223fab21650/que_harias_si_no_tuvieras_miedo.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/pevopuzuzevire.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/vegoxazulopegilagebuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74234288-c804-40f1-a096-b3676eb024a2/fezopopete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e167b240-57ad-4312-8138-c365d320441b/ahsoka_tano_vore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa22e042-74aa-493a-a635-a650e05c07fb/7947788447.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E694 3588 bytes
SHA-256: 73b1382d1eec51486c0e5adef236d127c4bb2053cfd782f8fc9da01e0f302d6d

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