Malicious PDF — malware analysis report

Static analysis result for SHA-256 274c699e04f2dfa0…

MALICIOUS

PDF

81.8 KB Created: 2020-12-20 14:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f07f105321fdb3f8ce765af26919ecf SHA-1: d00bc470d99809a18d52789cbd8934b0493c4b30 SHA-256: 274c699e04f2dfa08abf037b86ca814e5c19030fece0af0a811debb28a2db6ad
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=terminos+contables+en+ingles+mas+usados
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/gejajubesolen_rivip_wiwexigimimor.pdf
    • https://cdn-cms.f-static.net/uploads/4468837/normal_5faf5ba2f09ce.pdf
    • https://minikugonon.weebly.com/uploads/1/3/4/5/134500064/f8ca0e788a.pdf
    • https://goruxevuretu.weebly.com/uploads/1/3/4/8/134851502/gixubug.pdf
    • https://cdn-cms.f-static.net/uploads/4410985/normal_5fa2f4b0e9925.pdf
    • https://nimateson.weebly.com/uploads/1/3/4/8/134881528/fajulizuj_jizedidar.pdf
    • https://valaxekujabe.weebly.com/uploads/1/3/4/6/134653377/fizob_vefufilirusav_jexipo_kabulogafupazo.pdf
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/1226492.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0c777036-e6e1-4710-bd33-b530d64cc73a/chat_zwamel_maroc.pdf
    • https://s3.amazonaws.com/nonabafat/16034914564.pdf
    • https://s3.amazonaws.com/bufexa/books_online_for_free_to_read.pdf
    • https://uploads.strikinglycdn.com/files/373e9619-3833-4e84-b24b-8c8e89467a43/mimadaxadixik.pdf
    • 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_off0001027f.bin
9b17d5baf41949d9ba5e07c78bd523eff467ba90e816e6502047a2352e409a5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 5348 bytes
font_01_sfnt_off0001148e.bin
4e6224e2db963fe8595762d804cf4026a985a4768dac62d0681a4d01974c9e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 10924 bytes

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