Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a16f39c341c197…

MALICIOUS

PDF

75.5 KB Created: 2021-06-07 11:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 813c303e201bdec35c048d05dffc8bfe SHA-1: 3362a208aa480f3c8a1728cb1f4058c92ecf2116 SHA-256: 94a16f39c341c197b1adc347166855bad68a00b57bfb6db26f6add69be0fe783
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, with one prominent URL being `https://pixomot.ru/pbw?utm_term=callers+can%2527t+hear+me+on+iphone+xs`. The presence of many links to potentially disposable hosting services suggests an attempt to drive traffic to malicious or spam-related websites, likely for phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/pbw?utm_term=callers+can%2527t+hear+me+on+iphone+xs PDF link annotation
    • https://mulafixi.weebly.com/uploads/1/3/4/3/134317856/sizizol.pdfIn PDF document text
    • https://rizamarorupewug.weebly.com/uploads/1/3/4/5/134527102/0c216836de84.pdfIn PDF document text
    • https://xabetibupu.weebly.com/uploads/1/3/0/7/130738966/439efb394196eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_600dd9a411b7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450884/normal_5febeb763e7b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_60454b8fb4aec.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/7792131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_60486c8fc4cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_6026bef33cf76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5fdbe0d412d87.pdfIn PDF document text
    • https://tabuxeniki.weebly.com/uploads/1/3/2/6/132682737/kifuwolet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378830/normal_603381e6a6b07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e060fedf-9788-4f4d-9664-b50d2afb5d9e/how_much_does_sweat_bbg_cost.pdfIn PDF document text
    • http://nojewalikar.pbworks.com/w/file/fetch/144718482/89430925846.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/w/file/fetch/144662523/minecraft_1.7._10_indir_apk_pure_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702979c0-ab57-48dd-af04-4358df3826ca/4689961669.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/nadra_e_sahulat_multan_cantt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6658150b-5359-4e52-8064-96f49b8adecd/96069107010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faebfed8-4481-4fee-a7d7-0665ffb68e90/81529925280.pdfIn PDF document text
    • http://vikiruji.pbworks.com/f/poweramp_full_version_unlocker_apk_free_download_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca974810-8263-4fcc-813f-20e3277af0d6/sevutusovopedupapin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7ce5ab-36e4-44ec-b8e8-17937e228451/35742982288.pdfIn PDF document text
    • http://paditoxef.pbworks.com/w/file/fetch/144485556/how_to_use_jbl_flip_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f616c544-cbf9-48fb-8d19-ad87d782e093/wosewulajeliguniromowozuj.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_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 5180 bytes
SHA-256: 81df7e5fb81faa11b728e27ca97eddbf87d729913dfc2da92d9451c0786e1f19
font_01_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 10572 bytes
SHA-256: 235a39672be559f1858154b4d2d9c650bed9b170273ec32be30876f04d533474

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