Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28a5a7e4286743e…

MALICIOUS

PDF

69.3 KB Created: 2020-11-21 20:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b5258983b0e29ce1742e41d5ba3d9238 SHA-1: 1d536df155b8522227c9e859e02c0fe04e622c48 SHA-256: c28a5a7e4286743e787f56bfdfc274cb23ca23955efaddd22e3558863e2ad99a
204 Risk Score

Malware Insights

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

This PDF file contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this sample as malicious. The document body, though heavily obfuscated, appears to be a lure, and the presence of multiple links suggests an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the link redirection is a primary indicator of malicious intent.

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffine.ru/123?utm_term=in+the+following+conversation+which+group+discussion+technique+does+han In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5fa503a29056f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_5fa0ec5b76b66.pdfIn PDF document text
    • https://jifefovemerozix.weebly.com/uploads/1/3/4/4/134444698/zikidupibidanoj.pdfIn PDF document text
    • https://kakezilek.weebly.com/uploads/1/3/4/4/134401463/donujoxulowufub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_5fb03826207ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f8d4f07067e9.pdfIn PDF document text
    • https://luminesip.weebly.com/uploads/1/3/4/1/134108660/9986202.pdfIn PDF document text
    • https://zudabipepapob.weebly.com/uploads/1/3/4/6/134672750/2762787752c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_5fab6617e2af3.pdfIn PDF document text
    • https://vojufutevale.weebly.com/uploads/1/3/4/5/134521456/riwuxozuxivaku_xenemeperagip.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/f83769be89c.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/vupagepotite.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/loxopudizus/dvd_menu_creation_software.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/daddy_sylvia_plath_analysis_shmoop.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_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 5632 bytes
SHA-256: 07185ea5f0e7f7e53ee674bb3734b2f44afa0285e14708c3e18e0a58393e16e0
font_01_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 11660 bytes
SHA-256: 41b8613c4ad20a30d4d0fda3617c6505bf772e11d22c74577f51ae68daf97a05

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