Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb850fca55128e5…

MALICIOUS

PDF

98.6 KB Created: 2021-04-01 19:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2078f11415db71942d5bb32d5db939e8 SHA-1: 14f2aec31ce61571749d225f9892ba63f6f881bf SHA-256: bdb850fca55128e535ad607ac76d0f719ff6a87c1c37b827f16dad90be6914c9
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://xajibur.ru/award?keyword=what+is+causal+comparative+research+pdf PDF link annotation
    • https://cdn.sqhk.co/jusulikipe/cggideT/free_robux_oct_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_602000ed174f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_6027fce578971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_6024f08ddea27.pdfIn PDF document text
    • http://tubesebove.medianewsonline.com/school_subjects_spanish_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5fcafe6f34d56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_605db69557c33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470835/normal_5fd63d5c84995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483361/normal_5ffe6c3d47c35.pdfIn PDF document text
    • https://cdn.sqhk.co/tolononof/dRlGja8/color_switch_birdhouse.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxugaveg/ZstmjCQ/earn_to_die_4_unblocked_66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_6041316eb1a05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_606352786de9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_6018de263f119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://votasaze.rf.gd/incident_report_template_security.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/xogozozapugejemezavodem.pdfIn PDF document text
    • http://rosevasejila.myartsonline.com/zebesijupazuxokofetuvineg.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/nekonisonixalosopiz.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/hungry_shark_evolution_android_oyun_club_hile.pdfIn PDF document text
    • http://patuwovoparivi.rf.gd/rules_of_capitalization_and_punctuation.pdfIn PDF document text
    • http://lekipidupi.rf.gd/lobaziwilejemin.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_off0001434a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434A 5468 bytes
SHA-256: e849fd6f0547aad77d5de20833f65f21b86540ef7f80976635b513f292a14bfa
font_01_sfnt_off000155ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CA 10948 bytes
SHA-256: 994858f595814d8cc2982139c938df29f588233f8288ad0132aa7f8701ad94ce

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