Malicious PDF — malware analysis report

Static analysis result for SHA-256 be93cead66f5ebb9…

MALICIOUS

PDF

79.1 KB Created: 2021-03-31 09:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fa449ffbebacd6ce1d2a134f62c89709 SHA-1: 59146322ebf2c6bb7954abc219f7e4fb1ec35cc3 SHA-256: be93cead66f5ebb97c098d440195e99e936e701bf654ed27fb8c54379103b8a7
186 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 disposable hosting, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://nipisod.ru/strik?utm_term=2013+dodge+avenger+2.4+serpentine+belt+diagram PDF link annotation
    • https://gufagopa.weebly.com/uploads/1/3/4/6/134660265/9243343.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/WhaiguT/commuters_sans_semibold_font_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5fea149182510.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/9dc0945f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_603e834f810a5.pdfIn PDF document text
    • http://wudaxozibutix.sportsontheweb.net/tawinufo.pdfIn PDF document text
    • https://cdn.sqhk.co/nazalugewu/8aCtih7/banshee_full_series.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/e4tG4gh/29575671995.pdfIn PDF document text
    • https://cdn.sqhk.co/givikofuf/eijhbgd/dinosaur_battle_world_championship_game_download.pdfIn PDF document text
    • http://tinipen.medianewsonline.com/sujabezuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485702/normal_6042e453a9f55.pdfIn PDF document text
    • https://cdn.sqhk.co/xanovika/4iagdPL/zasowadoxofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_5fd64464e933e.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/43004978230.pdfIn PDF document text
    • http://dalosizofovabes.medianewsonline.com/death_cure_ending_reddit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451549/normal_602a14edad119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_ab228e115d24462ea9f8d4971eaadaf3.pdf?index=trueIn PDF document text
    • http://nukilaba.myartsonline.com/kohler_dtv_valve.pdfIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_6b93b6ddfe54413da199f03d3db34f79.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_456ae5f50a9949b4a48c24cdfd861d8d.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_3eae556e087e441cbb4e8f24c2bf346b.pdf?index=trueIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_e14c4cdc7cfc496a82eb411844fc0387.pdf?index=trueIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_a984b67d002646709ce0cd0fada55bdb.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_ec4d12c20e574bf381e2eae5ff25a384.pdf?index=trueIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_8707e2c3f0324f7f9403ac0dbea7c51c.pdf?index=trueIn 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_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 5992 bytes
SHA-256: 3bdb90a314165c358ea12461735fc2aede179cc9fc78fd0bea2a3b3cac40df5d
font_01_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 11040 bytes
SHA-256: be2697f843aca81472ff105a401decfcc7a99dd6625a0353b3f06d98df153e13

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