Malicious PDF — malware analysis report

Static analysis result for SHA-256 67fd4342072bcf50…

MALICIOUS

PDF

74.8 KB Created: 2021-02-27 14:32:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1e2becd4e1b4db81269e57ee951658d0 SHA-1: b764eac6900091f1fb568fc53d15d9b4a8dfaee9 SHA-256: 67fd4342072bcf5048be52578769f10a7cbb95d0c07037dadc0d9c58c76c9358
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, with at least one pointing to a suspicious domain ('vilenefex.ru') and another to a link farm ('bionatur.space'). The document body, though heavily obfuscated, suggests a lure related to comic book grading, likely a pretext for the embedded malicious links.

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://vilenefex.ru/aws?utm_term=the+official+overstreet+comic+book+grading+guide PDF link annotation
    • http://bionatur.space/school_website_responsive_html_templates_freeb1got.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416332/normal_5fff314bdde43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455387/normal_60388c934cc88.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/rowagegevaridu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_5fe94f0ff0886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_601b21ca59057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_6018607eb68e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_601cb15515687.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384639/normal_5fe175973dad7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412774/normal_6000434a926d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378836/normal_5ff1ceb0a9fc5.pdfIn PDF document text
    • http://yarrebitteh.online/cnn_student_news_weekly_quiz_answersozvsb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muxolisakij.epizy.com/asphalt_xtreme_apk_for_pc.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/best_online_vet_tech_programs_reddit.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/wii_error_message_50299.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/how_much_do_software_engineers_earn_in_uk.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_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5648 bytes
SHA-256: 5ef4ddb91325e23fc3cd0b059d1f89ac276f822d1c760cd06ed54d03125b97f8
font_01_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 10764 bytes
SHA-256: 65a1574070bbafa9cf6678ffc05268714ae66b2c2f487501923d951dada60e7d

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