Malicious PDF — malware analysis report

Static analysis result for SHA-256 971bfb723b7c4b62…

MALICIOUS

PDF

101.2 KB Created: 2021-04-12 20:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dbf11af7f62c3ea0398b4d782dfaf8e0 SHA-1: 96ab04f4f1f600e9aeecf7d028d3244cef9d62ec SHA-256: 971bfb723b7c4b62ce8303ecd1db11a2b79e9195aebd6f3bfd06f8ceb94117ce
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://botokaw.ru/strik?utm_term=victsing+shower+speaker PDF link annotation
    • http://lp-consalt.ru/wills_eye_hospital17em6.pdfIn PDF document text
    • https://mesaxejako.weebly.com/uploads/1/3/4/0/134097573/zodomupodoviji.pdfIn PDF document text
    • https://posilukununafux.weebly.com/uploads/1/3/4/4/134498017/036495eeffe5b4c.pdfIn PDF document text
    • https://xidekudogigut.weebly.com/uploads/1/3/4/6/134683706/34ad361b5a68f6.pdfIn PDF document text
    • http://0fruit.space/zosafigop38g.pdfIn PDF document text
    • https://kubamugikogili.weebly.com/uploads/1/3/4/5/134508843/vuwufo.pdfIn PDF document text
    • https://daxolefuziru.weebly.com/uploads/1/3/5/9/135963055/9008538.pdfIn PDF document text
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/dewibota.pdfIn PDF document text
    • http://lg-copyright.com/attack_on_titan_season_3_part_2_blu-ray_best_buyi9uty.pdfIn PDF document text
    • http://table-wait.com/vinadhue86.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/napokojame.pdfIn PDF document text
    • https://kopomitesukov.weebly.com/uploads/1/3/1/4/131453216/5484290.pdfIn PDF document text
    • http://front-glass.space/42646770176admg6.pdfIn PDF document text
    • http://kexumojazo.mypressonline.com/strength_and_durability_of_concrete.pdfIn PDF document text
    • http://mon-cmbretagne.com/lazuwanegoburuvqs4i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_8584b436698e41488f8ea8ade68e235e.pdf?index=trueIn PDF document text
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_a31115d218cf497b95234e32215d4ef3.pdf?index=trueIn PDF document text
    • http://xijewixevav.onlinewebshop.net/sociology_class_11_ncert.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_b8cb225479c24bfeaa6e7eb8ec035659.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_off00014e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E79 5284 bytes
SHA-256: 37b96c534645b36ffe4b15c64dc09856131a78731303fd6b281ca2d9f96f6097
font_01_sfnt_off00016084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16084 11696 bytes
SHA-256: a20640debdcad5a2704ef3ed2b180699ce6060de9c8b6d36bcd73cfd38fbb2c1

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