Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a479d98dd1dc85f…

MALICIOUS

PDF

77.2 KB Created: 2021-01-19 14:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e6cd2acd14f1b9e9e9bf5ff12fae5563 SHA-1: 9e8726d85a4b49b0295a272b38835023fb0f1109 SHA-256: 6a479d98dd1dc85f4dbcfcebe288a7ac45ca96a8fe83e86523fe191a7d6c5661
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified as a phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm heuristic further supports the classification as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=light+bulb+cage+menards PDF link annotation
    • https://site-1177531.mozfiles.com/files/1177531/bookkeeping_software_free_windows_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481285/normal_5fcd888d90574.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421209/normal_5fce6c28d5396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5fdd4a8f0ed42.pdfIn PDF document text
    • https://site-1194081.mozfiles.com/files/1194081/zasipij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486563/normal_5fe9d9cfb6c68.pdfIn PDF document text
    • https://site-1177566.mozfiles.com/files/1177566/27764267688.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/kopisigapub/92362702335.pdfIn PDF document text
    • http://puzasapexuwuju.epizy.com/edible_frosting_sheets_for_cakes.pdfIn PDF document text
    • http://bawilifugoxak.epizy.com/buenos_aires_tourist_map.pdfIn PDF document text
    • http://borovob.epizy.com/rustoleum_cabinet_transformations_linen_reviews.pdfIn PDF document text
    • http://kobukapun.epizy.com/business_dictionary_by_farlex_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/ill_give_you_the_sun_chapter_summary.pdfIn PDF document text
    • http://zejagal.rf.gd/canada_student_visa_rules_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/chamberlain_whisper_drive_plus_evercharge_manual.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_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 5436 bytes
SHA-256: db4d9a8bf711653392dd617fa8c3393ef21948b90c99ea40250faf6bd26b6b12
font_01_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 11644 bytes
SHA-256: b9e745dcf526795588db24767f69a031ebdbb8896bbc8e98476685173ada08ef

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