Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6bc1c31808a44a…

MALICIOUS

PDF

70.2 KB Created: 2021-02-06 21:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c820a7907dad5ffeb32108e0ab5ceea1 SHA-1: 30dd5a7024db6ebb2db221b21019ffb3967e51af SHA-256: 7a6bc1c31808a44ac098f7e81161ceb347f2cc889088355a5ce3e4066a23344b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://leonvi.ru/aws?utm_term=animal+diseases+and+treatment+pdf PDF link annotation
    • https://cdn.sqhk.co/vizinifum/1iaijl8/39143578524.pdfIn PDF document text
    • http://ita-women.space/biblia_de_estudio_thompson_en_linea_gratis1oobh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fd719f5e1447.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/ia4ij1K/water_racing_games_free_download_unblocked.pdfIn PDF document text
    • http://businesslinecenter.com/365332102753yjj.pdfIn PDF document text
    • http://khanapoorti.com/60892815290ff37c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5fd736e320a91.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/hhgheih/rt_syria_news_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_5fe97006bf0b3.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/cgggjNa/the_art_of_war_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/6ji3HpM/deer_hunter_2018_mod_apk_latest_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5fe4f3b9de86f.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/hdhbOnF/dapugudedibesalipefizanan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5fe82d0dabb41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5ffe451a15bbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482190/normal_5ff20f5d36273.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392877/normal_5fe26be19864d.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/igjd5he/pevavadokikimosules.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://soxomidil.epizy.com/ketunezimabapi.pdfIn PDF document text
    • http://xevikosurozogin.rf.gd/cute_couple_wallpaper_full_hd.pdfIn PDF document text
    • https://medlineplus.gov/animaldiseasesandyourhealth.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8A 4852 bytes
SHA-256: 3604eec9a0360573bffb8c44720a427e493e0c217d7ed0abefd49c6653343e22
font_01_sfnt_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 9856 bytes
SHA-256: d7b4d8475075f48189fdf2c4020cb5653d8534cb2ede30316cb9693f562af33f
font_02_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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