Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ead59de52aaa992…

MALICIOUS

PDF

77.4 KB Created: 2021-06-01 15:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b6618d03bfe8ace92d011880f73eada SHA-1: 782f370fdaf59d28a9a3b98e88add7ecd4502622 SHA-256: 9ead59de52aaa99261edf92ff0806a84d39e6af56e7a540b8fd83c26f01b11ea
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other free hosting services, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/pbw?utm_term=what+is+the+setting+of+the+story+jack+and+the+beanstalk
    • https://mitometivu.weebly.com/uploads/1/3/6/0/136094147/jutufuwegowo.pdf
    • https://cdn-cms.f-static.net/uploads/4452850/normal_60544437a4a26.pdf
    • https://cdn-cms.f-static.net/uploads/4472494/normal_600c4269507b5.pdf
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/913bd48.pdf
    • https://cdn-cms.f-static.net/uploads/4451210/normal_60378c53f3246.pdf
    • https://cdn-cms.f-static.net/uploads/4392439/normal_60305f7dc6590.pdf
    • https://jadotonevuwupu.weebly.com/uploads/1/3/1/4/131407011/rejagujagupenov_wawegug_zesebopelen_nimul.pdf
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/1390951.pdf
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/7b3f1.pdf
    • https://cdn-cms.f-static.net/uploads/4378405/normal_60653e9c8eb77.pdf
    • https://sojagifuwolu.weebly.com/uploads/1/3/4/6/134689160/walijakejaleso.pdf
    • https://kuxozofaxaxasij.weebly.com/uploads/1/3/5/3/135325708/1602723.pdf
    • https://kupifima.weebly.com/uploads/1/3/0/7/130775493/4330798.pdf
    • https://rokegijigu.weebly.com/uploads/1/3/5/9/135978077/9764998.pdf
    • https://cdn-cms.f-static.net/uploads/4454546/normal_60537acf79020.pdf
    • https://cdn-cms.f-static.net/uploads/4380395/normal_60334cc8af63d.pdf
    • https://static.s123-cdn-static.com/uploads/4388841/normal_5fcdce49e7ed4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/37508b90-d4f5-48cd-92d2-4c97c9eef3ca/javitep.pdf
    • https://uploads.strikinglycdn.com/files/0cdfe8dd-1faa-44dd-a9b3-cd6210c0b230/how_to_understand_hair_color_theory.pdf
    • https://uploads.strikinglycdn.com/files/57faff65-351e-4fc8-8044-05ce9e49cbfe/gawopiwadunarit.pdf
    • https://uploads.strikinglycdn.com/files/8e388247-70fe-449a-ad73-1b04884c8d96/arms_reach_mini_arc_co_sleeper_leg_extensions.pdf
    • https://uploads.strikinglycdn.com/files/779dabd5-6c20-4e8b-a47f-ba6a252ed7a9/qu_funcin_cumple_el_sistema_circulatorio_en_el_cuerpo_humano.pdf
    • https://uploads.strikinglycdn.com/files/3a87ea7a-2240-43fc-9467-f98784e35bfa/32719545691.pdf
    • https://uploads.strikinglycdn.com/files/eafbc22a-48cb-4e53-8fbb-3d525fb9fbc9/percy_jackson_and_the_battle_of_the_labyrinth_graphic_novel_free.pdf
    • https://uploads.strikinglycdn.com/files/2e4eed4c-9238-42ac-b6aa-e3e7d0165715/73658407783.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9b.bin
fd774c601603778f6929684b3fa3bc570fdffcfa4159bd00ad20b02664524d12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 5676 bytes
font_01_sfnt_off00010302.bin
1b9e9a166a2f0d0f5db43f51ec2186621b041341865dd3a0a183d975c4640f93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 10860 bytes

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