Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce11b8d7bb6f930a…

MALICIOUS

PDF

65.2 KB Created: 2021-01-10 10:56:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 712075b33066aec66e211a028c965f3a SHA-1: ecfa01b5dd6250d97a3e599687d978d2600a2904 SHA-256: ce11b8d7bb6f930a2aa1d66461a3f6765855767ebad662de72b24ddbc366d2b2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, hosted on disposable domains. This behavior is indicative of SEO manipulation or a phishing campaign, aiming to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://trafffi.ru/123?utm_term=martins+ferry+high+school+teachers PDF link annotation
    • https://taxubixud.weebly.com/uploads/1/3/4/7/134760406/2dc33a49.pdfIn PDF document text
    • https://lezanaxowap.weebly.com/uploads/1/3/2/6/132696506/geforulakisetezuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408586/normal_5fcf8558e3626.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/57b90e8.pdfIn PDF document text
    • https://tazavuzinun.weebly.com/uploads/1/3/4/6/134600399/xofipafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_5fae5843ebe27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387706/normal_5fe0611d632e6.pdfIn PDF document text
    • https://doxorovovo.weebly.com/uploads/1/3/4/4/134479089/nopumogekamax_jogidugowe_tagumopitozore.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/sakitivezilike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409607/normal_5fb92dede25ca.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/lumulukave.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368747/normal_5fed268a4e505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC305 5248 bytes
SHA-256: 6321da2a24e12f15857866d6a0a1463f2277b7052f5a4b242ef24095a117e09d
font_01_sfnt_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 10300 bytes
SHA-256: 2faa81e9ea75460e43d2282538e4aa1f63c61f4f956d3543c8a7ce1a60ca05f0

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