Malicious PDF — malware analysis report

Static analysis result for SHA-256 d416c93f6777bdaf…

MALICIOUS

PDF

95.0 KB Created: 2021-02-15 22:09:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c9d1cfd6bfc0969255874267e628a37b SHA-1: a10801ef72fea962d1c15916535392e75952ed2a SHA-256: d416c93f6777bdaf84f826be69499c21d580ab5c715085fd58431827beced0bf
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URIs, many of which point to disposable hosting. The PDF's content, though heavily obfuscated, suggests a lure related to a 'diet pdf download'. The presence of multiple external links and the 'link farm' heuristic indicate an attempt to direct users to potentially malicious or unwanted content, likely as part of a phishing or scam campaign.

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://maypoin.ru/strik?utm_term=dr+sebi+mucus+free+diet+pdf+download PDF link annotation
    • http://poverkavoda.website/nodiravobiw9q6d.pdfIn PDF document text
    • https://jerolukemotib.weebly.com/uploads/1/3/0/8/130874115/833f9ade.pdfIn PDF document text
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/0fafed1.pdfIn PDF document text
    • https://gemujofu.weebly.com/uploads/1/3/4/3/134372819/0f6bcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415327/normal_5ff14ebed2e27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_5fdc18cc0d9b3.pdfIn PDF document text
    • http://balifruit.com/crime_and_punishment_study_guide91xje.pdfIn PDF document text
    • https://dasibovuripuxub.weebly.com/uploads/1/3/4/8/134860981/tulogofu.pdfIn PDF document text
    • http://porn77.design/499550821015faqi.pdfIn PDF document text
    • http://eu-study.ru/x-_ray_body_scannerz9o8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_6029059cd6fa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_600b2a3d24fcc.pdfIn PDF document text
    • http://misstourist.info/coreldraw_for_macbook_pro_freeusigf.pdfIn PDF document text
    • http://expressday.online/transparent_translucent_opaque_worksheet_grade_2fsvef.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/megodipewukitoj/bosch_classixx_dishwasher_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/rutedufijukipejuxutipu.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_off00013771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13771 5532 bytes
SHA-256: f3ea7cc627b3e5a1b747886ea20e203b1ae733b612163d20dcdb79d53ba2a578
font_01_sfnt_off00014a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3E 10752 bytes
SHA-256: c089b6e991fb1b8f8290d84af84e66e4998445e1a9f7a40fae1d129e17b82542

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