Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c79901ffd60d9e…

MALICIOUS

PDF

94.5 KB Created: 2021-04-05 04:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9036431ef7c8f0dca3225ff0728b5eaa SHA-1: b7d62df015428df80de6a001d693557068e06344 SHA-256: b4c79901ffd60d9edad5f5230f9bd5dc4a54bece875efa09b8c49c64ea6ec140
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with at least one pointing to a domain ('golowaki.ru') associated with phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to academic content, likely to trick users into clicking the malicious links.

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://golowaki.ru/award?keyword=fenomeno+de+migracion+placentaria+pdf PDF link annotation
    • http://bbbbbbbbeeee.space/bakulaxelubuxikuwemuhyh10.pdfIn PDF document text
    • http://uaregroup.com/werafivuxutnl87.pdfIn PDF document text
    • http://lewuvumo.sportsontheweb.net/tomagofonexujuritiginep.pdfIn PDF document text
    • http://posiximuteg.sportsontheweb.net/58028298417.pdfIn PDF document text
    • http://megantv.site/work_power_problems_worksheet_answersbqicq.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/stoeger_12_gauge_m3500_reviews.pdfIn PDF document text
    • http://all-gopro.com/screen_recorder_software_free_full_version3jtoy.pdfIn PDF document text
    • http://dspace.uniandes.edu.ec/handlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sivebobaxibi.epizy.com/jquery_ajax_php_form_validation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec2afd0-74c4-4a69-b6bb-33d1b82e172a/mixed_verb_tenses_definition.pdfIn PDF document text
    • http://babirusup.epizy.com/lugujavugixuvomivised.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d097c8-6a99-4385-b7e3-2b9c5edf80f5/dnd_5e_critical_hit_attack.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/calculo_integral_conceptos_basicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb5a8fe-06d7-458a-a21b-7c47bede489e/lukiziwek.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/kolopo.pdfIn PDF document text
    • http://wovibojo.onlinewebshop.net/alchymista_kniha.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/761af833-fd71-42a3-a9a3-0771e2bba91d/nifogora.pdfIn PDF document text
    • http://jemudizibumak.epizy.com/73353591895.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/45691028756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a79a5a41-2722-467e-b6f1-1e0c1d0cf362/preposition_quiz_5th_grade.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 5040 bytes
SHA-256: 027f4868fd8430d90d1d6e1729529fe4e9fb3c84559b952e4aada4517b60698f
font_01_sfnt_off000137d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D9 11732 bytes
SHA-256: 51fa1c9ca19f176247edcb70b65384e27fa6e36a0ee9f7d64c9ee2bb53dfca5f
font_02_sfnt_off00015e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E42 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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