Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb4626bd946361a…

MALICIOUS

PDF

70.9 KB Created: 2021-01-01 12:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c42697511d3d212189bc663a22ef28d7 SHA-1: 4d85e2a5afc9ba0d84b8876c0b5075678c885473 SHA-256: ccb4626bd946361a635af4b30163319f83edc0acddd8c168fa78a4294a2ba64b
244 Risk Score

Malware Insights

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

This PDF file is flagged as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves as a phishing or malware distribution vector. The document contains a large number of embedded links pointing to external PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The presence of a link to a known malicious redirector further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://gettraff.ru/wb?keyword=exocytosis%20vs%20endocytosis%20vs%20pinocytosis In PDF document text
    • https://duvefotod.weebly.com/uploads/1/3/1/3/131380754/63c8c49bb9a04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459624/normal_5fe59dfb23bbc.pdfIn PDF document text
    • https://wapapoda.weebly.com/uploads/1/3/4/5/134581042/bukumonabuk-gazovek-sadigabave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_5fbabe694caac.pdfIn PDF document text
    • https://tetikofigutuda.weebly.com/uploads/1/3/4/4/134445118/mujuxewutupumo_fubominogoz_vanosadegab_xofipizo.pdfIn PDF document text
    • https://cdn.sqhk.co/fexonawizoz/Fjf1kZr/34371792518.pdfIn PDF document text
    • https://pixogapowirotuj.weebly.com/uploads/1/3/4/6/134641161/9799175.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/bodilapazivuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_5f9a8880b33cd.pdfIn PDF document text
    • https://luvuzinek.weebly.com/uploads/1/3/4/5/134502649/3187916.pdfIn PDF document text
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/23d4ff8052a1b1.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/jeQhdgj/catchmaster_612_multi-_catch_mouse_trap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/33094639871.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 4916 bytes
SHA-256: 952d617307f2d1743b7d9853424ea51eaa70c545d65c5c8f3f473fdf090bd138
font_01_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 9976 bytes
SHA-256: 71e1d46831ae31c4158827addf5c95591893976c0d58ab3a2172c497a6a2665b

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