Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1b104afd37ff98…

MALICIOUS

PDF

88.1 KB Created: 2021-06-03 04:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: af7f405c2ae3659ce0837513814be245 SHA-1: 50bc23252d1d660a4f061dd679c14d83f5a435bd SHA-256: 1d1b104afd37ff98926b75559f35c1d47400ce092785b643d1c1c53d5f003463
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 0.9917

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://inwebjor.ru/pbw?utm_term=como+ver+un+partido+de+futbol+en+vivo+por+internet+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408323/normal_5fe82213a44aa.pdfIn PDF document text
    • https://xupazipul.weebly.com/uploads/1/3/5/3/135325103/repiwojatox_kekegoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_600e11934c516.pdfIn PDF document text
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/9e4d0afea1958b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457302/normal_6001394bd5c35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389801/normal_5ff169dc2f8c2.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/2f8275d22c6808f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488103/normal_5fc734c06a17b.pdfIn PDF document text
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/gudasulu.pdfIn PDF document text
    • https://peletawipimo.weebly.com/uploads/1/3/4/4/134444154/lasinipagu.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/34d6c55a-29fb-46f5-b827-64899ea47bab/canon_eos_digital_rebel_xt_review.pdfIn PDF document text
    • http://sovafiben.pbworks.com/f/kerovukasudisotokubomepaz.pdfIn PDF document text
    • http://kizisoj.pbworks.com/f/paraphrasing_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c325f8-94d2-49bc-bd91-d22c726e4571/behringer_xenyx_1002b_premium.pdfIn PDF document text
    • http://xujefix.pbworks.com/w/file/fetch/144417213/mowovufubepepar.pdfIn PDF document text
    • http://dejimebez.pbworks.com/w/file/fetch/144421140/kixibomewopefalufot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec965ef1-7061-4b08-bdeb-6666508d33c9/femirutoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3910aa-1a09-4700-9f3f-e9a4c5282f60/ap_lit_question_3_prompts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f37c58-bece-4cf2-830c-4cdd6e220f0a/badger_1_2_hp_garbage_disposal_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f609c2-a695-489d-813c-13aa59926964/williams_j._h._jr._fundamentals_of_applied_dynamics.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/f/essentials_of_human_development_a_life-span_view_2nd_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be73e84-6c21-4902-86dc-1f3c3454b0c4/el_juego_del_angel_final.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144419148/nuwawujubibokokedadekuf.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/rangers_apprentice_book_13_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828a9d2a-d99d-4581-b9b9-51e31070114e/nadapu.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144515976/3847589804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2951bce1-cdd8-4238-90d3-970e98ca29ad/40094654459.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 5468 bytes
SHA-256: cb4097b7070d6294028c3a48e43bbc7ea156143811610998f8671f949af1075c
font_01_sfnt_off000109fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 1932 bytes
SHA-256: 39330ed8423990a2d20423238ca7e853f83bb3385386a7ba3cedc5b4ca46caa6
font_02_sfnt_off0001133f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 11616 bytes
SHA-256: c5ba6f92fb72a44c7d4b22dc8f385fc03c4a376f71ccd13196b8dbc4a387b5d8
font_03_sfnt_off00013965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13965 16256 bytes
SHA-256: ccb13d41afe21ee89e53c3f27717ac94378910443654e14806548dbd4f8047b9