Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d3dde3d749c24f…

MALICIOUS

PDF

72.3 KB Created: 2021-02-26 08:21:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b7643a98129914afa5a991a6d65151c1 SHA-1: aa6e048f4aecdbe787fae89d1b3354d1bdc91a9c SHA-256: 79d3dde3d749c24fa749af129181b79d484574179f9482a3bffe9f8370ec29a9
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least two pointing to disposable hosting and acting as link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

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://leonvi.ru/aws?utm_term=should+i+buy+hearts+of+iron+4 PDF link annotation
    • http://bigswinner.space/pearl_of_great_price_catholic_biblevbexg.pdfIn PDF document text
    • http://noxerazomefo.iblogger.org/86302778901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_602c315169113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_600d8e6945ec2.pdfIn PDF document text
    • http://sparzha.club/que_son_alcanos_alquenos_y_alquinos_ejemploslt2f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_602aa54769325.pdfIn PDF document text
    • http://pagixuzipalopa.iblogger.org/black_and_white_tegu_care_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_6018f02974c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_6011d301bff19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445557/normal_5fde3c8064afa.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/jifedefujodu/bill_browder_red_notice_free.pdfIn PDF document text
    • http://pofabavulaxeli.rf.gd/short_biography_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/unemployment_allowance_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/xeped.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/zamaxuditeriru.pdfIn PDF document text
    • http://bunurakugixopa.rf.gd/curriculum_development_process_models.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_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 5428 bytes
SHA-256: 34e1f63c00b7a7b40d4da7dc23ce6e43f23aaed7d9539c8ae949799c5d9f0c82
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 11092 bytes
SHA-256: 65916fa01b90315fc9290d468cc8a1e844b55e009a6674c13e2d5534196048cd

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