Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d87aeb103ea8efd…

MALICIOUS

PDF

78.9 KB Created: 2021-02-22 08:11:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 354168727a18bab38ddb14817f44772a SHA-1: 9087deeeb182f6714449c41edaeaf4348a9a39f4 SHA-256: 5d87aeb103ea8efd2d6dcf37094e84ad6d650b6ad78ca2716ccdc47700e0da18
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to search terms and application metadata, consistent with a lure document.

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://leonvi.ru/123?utm_term=yamaha+dgx+530+price+in+india PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393220/normal_5feb8d2670d7f.pdfIn PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/7370019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496148/normal_5ff9c01f05b5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_6027350ea2907.pdfIn PDF document text
    • https://wejumarokurefa.weebly.com/uploads/1/3/0/7/130776247/df5a531b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zunebodiz.epizy.com/babul_teri_bagiya_ki_video.pdfIn PDF document text
    • http://lorenivi.rf.gd/vtech_cordless_phone_with_answering_machine_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/57609454459.pdfIn PDF document text
    • http://tivusanezidiv.rf.gd/castration-_resistant_prostate_cancer_aua_guideline_2018.pdfIn PDF document text
    • http://ditufadupogeju.epizy.com/c300_coupe_performance.pdfIn PDF document text
    • http://fefomuk.epizy.com/vabusumupejawoxopofowuj.pdfIn PDF document text
    • http://sexepafo.epizy.com/basic_instinct_2_2006_full_movie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 5336 bytes
SHA-256: ec338d4bcfee88991fc0fe6a246f308cd7140f542b7f393adc181f5fcacb9f4b
font_01_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 14704 bytes
SHA-256: 82e9add5791db849bc0073557d2195a8088a57c9557c545ca3383ef6e5783829
font_02_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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