Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2b916fc4a52aba…

MALICIOUS

PDF

76.4 KB Created: 2021-01-12 04:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d48c1788634fc1f1f9b3b17c1e45f36d SHA-1: 786745b2c4dd3c2baaac4e4a596f54f73dbc9687 SHA-256: bc2b916fc4a52aba3f41e951fc374fd9fda1c7c95aaad8fd0323ee908aba0a60
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a study guide. The presence of multiple embedded URLs and the ML classifier's high confidence score indicate a deliberate attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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.
  • 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://gettraff.ru/123?utm_term=the+great+gatsby+chapter+1-5+study+guide In PDF document text
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/2733337.pdfIn PDF document text
    • https://cdn.sqhk.co/fazovivum/Qme4hjY/carshield_reviews_prices.pdfIn PDF document text
    • https://pazuvokase.weebly.com/uploads/1/3/4/6/134615635/bixalifugiwi-vadevasonovo.pdfIn PDF document text
    • https://latudawa.weebly.com/uploads/1/3/4/3/134308630/vetazazugogume.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388283/normal_5fc68654005ea.pdfIn PDF document text
    • https://cdn.sqhk.co/kojanakif/fMwhiBg/w3schools_css_position_center.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5fa057f155d70.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/jufokejawem-valaroga.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/gdhdiak/pathfinder_kingmaker_knife_master_monk.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/nedijowewoded/4974194070.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/effective_java_2nd_edition_github.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/tosupawej.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/california_real_estate_exam_questions_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/fegumenozeviru.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_off0000eb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 5700 bytes
SHA-256: 9080d359d69208db44b320a89fcdeb36ea14a0c20216cbce31cf417402f54027
font_01_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 11288 bytes
SHA-256: c5b652c2b405daf4aa44c04eb305b358cd78059953302d32e561cc9995ef5887

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