Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8c8cd25bf5f041…

MALICIOUS

PDF

127.4 KB Created: 2021-01-10 05:30:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 71fa843dc653e47d6c56ad37aa914e77 SHA-1: e45b4a39f39b196945bc24ea02fd0ebab2f40d60 SHA-256: cb8c8cd25bf5f041850ea39faba3103a1d36187281e06055ec685fa314f3ac2a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to disposable hosting and link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafftec.ru/123?utm_term=rogue+eidolon%2527s+guide+to+fighters PDF link annotation
    • https://site-1218116.mozfiles.com/files/1218116/cute_mermaid_princess_dress_up.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/vomapilijamovex.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/jbxnia6/gamorefurin.pdfIn PDF document text
    • https://site-1172308.mozfiles.com/files/1172308/badasona.pdfIn PDF document text
    • https://xugibadibexupov.weebly.com/uploads/1/3/4/6/134684970/makuta.pdfIn PDF document text
    • https://site-1178687.mozfiles.com/files/1178687/54127462160.pdfIn PDF document text
    • https://site-1177793.mozfiles.com/files/1177793/toddler_bubble_pop_app.pdfIn PDF document text
    • https://site-1177495.mozfiles.com/files/1177495/bellator_mma_events.pdfIn PDF document text
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/kepebexurada.pdfIn PDF document text
    • https://cdn.sqhk.co/sukijubese/gejjD7h/art_therapy_prompts_for_eating_disorders.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/fiugd92/jailbreak_escape_craft.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001b695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B695 5000 bytes
SHA-256: 65213ec3df3e66130da0323d4b4ea9004c679cb0b7ef0ab503feea5d2d38c6f9
font_01_sfnt_off0001c7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7A4 12748 bytes
SHA-256: a5b665c49f4497f5414f3f53c439db6ca832b88998e2bf0439197604382cf936

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