Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a7c0bac8cd89c5…

MALICIOUS

PDF

58.6 KB Created: 2020-12-18 03:25:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 99966ed9dcb4655ee6363076afc68796 SHA-1: b4ef4aeb72f6b84add1bdb2bd9200cd272969d24 SHA-256: 25a7c0bac8cd89c548b319d5a85a0e42010862771c2f0e91c3a5290b572495ea
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URL 'https://traffnew.ru/123?utm_term=toshiba+vcr+dvd+player+instructions' indicates a lure to a potentially malicious site. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffnew.ru/123?utm_term=toshiba+vcr+dvd+player+instructions PDF link annotation
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/8141797.pdfIn PDF document text
    • https://xabetujozuveko.weebly.com/uploads/1/3/4/6/134682227/f6c319f950db.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/4029203.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/3347502.pdfIn PDF document text
    • https://tovepeluzon.weebly.com/uploads/1/3/4/3/134385389/7430674.pdfIn PDF document text
    • https://jubekajaduv.weebly.com/uploads/1/3/4/3/134345699/wekojame_tevef_pupavufafap_vemebekekeponif.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/zuponefi/batman_arkham_origins_apk_mod_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/headspace_guided_meditation_for_anxiety.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28802bda9c57a97c88755/t/5fcd2e87662d5e24e0ac1369/1607282313109/kingdom_builder_board_game_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/077e969b-ae32-4cd6-9b65-a6223be45476/lyrics_to_i_see_the_king_of_glory.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_off0000a97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA97C 5412 bytes
SHA-256: b187c7e60fac3bdc1595f3ba85cf215cf3dc9a1341c11d8556fc6943e70baad2
font_01_sfnt_off0000bbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE1 10080 bytes
SHA-256: 9e58a89729aab984590ed56b2e681f6b88c7cb0cc852fb521564f90e4ffc31a5

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