Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce4cec65bc938a4…

MALICIOUS

PDF

78.8 KB Created: 2020-11-29 10:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 73914bdc38ba48eb18ee90fbff951cf4 SHA-1: 1b3b2cc7b8ed28123bb6aac21ada2ae4c7775964 SHA-256: 3ce4cec65bc938a4eb8d53ca2c25ecc473ac3787d5d2284a1c49603fd2eb1c57
226 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a 'Remote-support tool lure' heuristic indicates the document may attempt to trick users into installing or connecting to remote support software, a common phishing pretext. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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
  • 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=vscode+html+formatter+not+working PDF link annotation
    • https://leniwexobopusez.weebly.com/uploads/1/3/4/7/134713406/137783.pdfIn PDF document text
    • https://xiwofisenitew.weebly.com/uploads/1/3/4/8/134879753/9186710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5fada5551a4b0.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/lerawoneli-gokuduguretaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449974/normal_5fad98ad9919a.pdfIn PDF document text
    • https://gonutorimi.weebly.com/uploads/1/3/4/5/134590267/famepi-vidoliteki-nipazifov-wupadof.pdfIn PDF document text
    • https://rupunapu.weebly.com/uploads/1/3/4/3/134354814/mitegilerofazot.pdfIn PDF document text
    • https://kawewadibuporak.weebly.com/uploads/1/3/4/3/134371142/fekituvita-buvematugenebe-xenadevif.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/9fb0644c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee3b1bd-e935-4e9a-b0d4-191ea66622f6/14811667328.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/69900621136.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2E 5556 bytes
SHA-256: b492a559ba95e315e1bcd605d81cd9234624a01863a123a4982301c4d0b91472
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 11352 bytes
SHA-256: 89d3cee865ca79b319b3e6f20fb103046c565316e4a6e1002fb2f400817a230a
font_02_sfnt_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 16576 bytes
SHA-256: 87d700297f79648df738d2df58e1e7d0b9397b5cf42e828fe620ef6592ef7b97

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