Malicious PDF — malware analysis report

Static analysis result for SHA-256 726a2a9462e59fa8…

MALICIOUS

PDF

96.1 KB Created: 2021-04-09 16:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a3306e726f6affe58e86e6f2a96f4af3 SHA-1: ac1cd4786cc27dae27bb871b276cd9f33ff640a6 SHA-256: 726a2a9462e59fa8ff1b8c7e5505dbdebf56dab1bf85de58053d1b2ae218ef3d
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, containing a large number of external URIs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=understanding+architecture+kent+state PDF link annotation
    • https://cdn.sqhk.co/kufejagefep/d7HVgdj/super_live_chat_app.pdfIn PDF document text
    • https://vepovipozo.weebly.com/uploads/1/3/4/4/134472033/9866422.pdfIn PDF document text
    • http://sodaapp.club/how_to_thread_a_white_sewing_machineohu3o.pdfIn PDF document text
    • http://aires.fun/interior_design_business_software_programso8loa.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/gKfPieM/77857704962.pdfIn PDF document text
    • http://cupe1.ru/207289443486qsuo.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/wgeLtKy/steam_workshop_downloader_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tokokoxisuf/4XApGie/ropetesugetogolurakikep.pdfIn PDF document text
    • https://batagokefo.weebly.com/uploads/1/3/1/0/131070859/zozufosolorox.pdfIn PDF document text
    • https://supidopize.weebly.com/uploads/1/3/4/5/134521205/956022.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/ggdhihg/tie_dye_black_sweatpants_diy.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/the_real_book_jazz9adm0.pdfIn PDF document text
    • https://tabugutiku.weebly.com/uploads/1/3/2/6/132682541/1d82d.pdfIn PDF document text
    • http://geleostone.online/manuale_di_pulizie_di_un_monaco_buddhistamanuale_di_pulizie_di_un_monaco_buddhista9wi1o.pdfIn PDF document text
    • http://ledy66.net/wilodot30bzt.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/7560a03d-12b1-4d0f-82f4-96dbbf6cc317/why_is_macbeth_the_shortest_play.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6ef64a-7b08-49fa-8238-e93f64da6fcf/como_agua_para_chocolate_laura_esquivel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12e2c668-a67d-447d-8efd-6d9920a29e0e/zoxolavilopopozo.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_off00013c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9F 5224 bytes
SHA-256: 6fa09144217f740d189ea3a29ad77b6b9dbda81bba847eedbc8c3bcb4bdd2d10
font_01_sfnt_off00014e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E64 10348 bytes
SHA-256: b8c2124c5b898f30cf17de14f2477a26da2de69e5fa7fec866409d4cdc3c5de4

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