Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f0432fb9764329…

MALICIOUS

PDF

78.2 KB Created: 2021-02-08 10:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7908ee58e8076a7a252c31f1089f7028 SHA-1: 100e3b00e3167f8f87f27e35db93ab6be87b6a42 SHA-256: 54f0432fb9764329b8ebc7044c31ff8b19c251e17094d80d2526d2cefa19e36a
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though partially corrupted, suggests a lure related to a 'puzzle box answer', which is a common tactic for phishing or malware delivery. The presence of embedded URLs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=100+doors+puzzle+box+level+24+answer PDF link annotation
    • http://de-bewertung-889562.icu/fejopololubenuzateri75peg.pdfIn PDF document text
    • https://cdn.sqhk.co/budotedo/cJehaib/ct_technology_education_standards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500189/normal_5ffc1992e722b.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/4Yqxxhf/free_quran_english_translation_book.pdfIn PDF document text
    • http://helper-badges.com/70114489748ajouk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463009/normal_6003f9a2c655e.pdfIn PDF document text
    • https://cdn.sqhk.co/volumusigu/tqYPJjh/ladubodiwufixomugazokadam.pdfIn PDF document text
    • http://magicwoolshop.com/sonny_s_pasta_san_clemente0mszk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492580/normal_5fe438dbb56ad.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/Otphaii/45257786003.pdfIn PDF document text
    • http://jakartapro.xyz/82710555893dklzp.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/cvtSVIv/54339932954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5fd646dc4c35c.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/O6D3hjg/gegutalorez.pdfIn PDF document text
    • http://bestplacefor.rest/32408480355j3azt.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/2573126191539blm.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/zewimu/hiring_public_room_listening_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/22878095411.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/free_math_worksheets_commutative_property_multiplication.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_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 5684 bytes
SHA-256: f2444f4942f763e83bc30e8d3e97f3b4dc7b776a46b1338f77bbd0af6506319f
font_01_sfnt_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 10472 bytes
SHA-256: 607e8ad1a5e8a1c525f243e520c71f7297d2c08fe251057c89eaf7d55391411b

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