Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff1271970230d0d…

MALICIOUS

PDF

66.7 KB Created: 2020-12-28 08:52:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8462bdd02935dcdac6ab12f0b210dfb8 SHA-1: d434ef32e5a07609db83a4eb644e52237e01d51a SHA-256: cff1271970230d0d08dc56bcf49cc86f5288e4364c9e12127c944b29b735ce15
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on services like Weebly and S123-cdn-static.com, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=eureka+the+boss+smartvac+manual
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/gekubebijigiver.pdf
    • https://static.s123-cdn-static.com/uploads/4368999/normal_5fe4920f65a49.pdf
    • https://webezajafe.weebly.com/uploads/1/3/4/7/134774073/1455073.pdf
    • https://mixekolasum.weebly.com/uploads/1/3/4/3/134388380/6581583.pdf
    • https://cdn-cms.f-static.net/uploads/4387582/normal_5f920b397f529.pdf
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5fb592f145d17.pdf
    • https://cdn-cms.f-static.net/uploads/4381978/normal_5fd8bb8c5fd0d.pdf
    • https://cdn-cms.f-static.net/uploads/4454967/normal_5fe7265a05787.pdf
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/kagarodoruvav_wogalowaz_lemobekad.pdf
    • https://static.s123-cdn-static.com/uploads/4425912/normal_5fc95eb6b08e8.pdf
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f86f52db2a02.pdf
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5f89b82f15e6f.pdf
    • https://cdn-cms.f-static.net/uploads/4481067/normal_5fbac578241fd.pdf
    • https://cdn-cms.f-static.net/uploads/4393626/normal_5fa7746c8030e.pdf
    • https://telanadiv.weebly.com/uploads/1/3/4/4/134495792/7926434.pdf
    • https://manoxumumaxu.weebly.com/uploads/1/3/4/4/134472756/senodukuz.pdf
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/662639.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000cae5.bin
03c229b4a21e13837d17d4af716fd6df6ab8fb59d63fdd62c791c4fb81e2dc75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE5 5260 bytes
font_01_sfnt_off0000dca6.bin
94bc0cb323713b30cf4441576e69322958d6450289d2cd6db9c512fe004d6493		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 9680 bytes

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