Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5460a1f99d1cf29…

MALICIOUS

PDF

63.1 KB Created: 2020-11-26 01:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 25f584303d95d04ee436215907a271aa SHA-1: 1b05c10aaa01e763ba50956d5ad6cccb9a011127 SHA-256: c5460a1f99d1cf298ad1ceed95dea46fe84bc08cfb9c8c64cbd8523586f4b8a3
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting services and some to known malicious redirectors. This indicates a phishing or scam attempt designed to lead users to potentially harmful content. The ClamAV detection and ML classifier further 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
  • 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://traffmen.ru/123?utm_term=wet+and+wavy+wigs+beauty+supply+store In PDF document text
    • https://kodivowu.weebly.com/uploads/1/3/4/3/134360374/xekuraxer_molatag_peteju_lezizerovul.pdfIn PDF document text
    • https://rewuxumo.weebly.com/uploads/1/3/4/5/134586949/9894602.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/257870745465e.pdfIn PDF document text
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/e11b9c9a1.pdfIn PDF document text
    • https://pugujexavifik.weebly.com/uploads/1/3/4/7/134702512/mojedukobijati-rijifojojim-bifawik.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/4675241.pdfIn PDF document text
    • https://waxojokizubow.weebly.com/uploads/1/3/4/4/134482073/rafafujadu.pdfIn PDF document text
    • https://dujezipiver.weebly.com/uploads/1/3/4/6/134610991/repuxoxuje-zojiwepuburaz.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/d5cb70dc-1fb8-4522-9681-1a17031b42d9/the_first_purge_parental_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/tuning_fork_for_cello.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8593794-2f2c-4cc1-978e-73ec9cfbc5c2/polewiledizivubelot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f55bb37-1f9e-4fdf-8343-fbf088ffbb60/cepde_gta_san_andreas.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/paper_cutting_designs.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_off0000b7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FB 5532 bytes
SHA-256: 7e6ca5ec4b04f57470df418b4e3057fcd4ea773587b7b5895144522f1e73cd94
font_01_sfnt_off0000cafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 10716 bytes
SHA-256: cc9c27129c1350461d64c4a7f062721a31371daede73f039deec9947540a5ebe

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