Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7da859346b9424…

MALICIOUS

PDF

79.9 KB Created: 2021-02-16 16:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ae758f3befe3da69124ac847cd632933 SHA-1: 057229ce177328126b410980a7942c087a16c28c SHA-256: 7f7da859346b9424351ee99ebfc4595654e6e5c628b57171b39e178fc9e4a3ed
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

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://seumenha.ru/123?utm_term=how+to+start+a+toro+power+clear+518+ze+snowblower PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372383/normal_5fdf90872839e.pdfIn PDF document text
    • https://toposizijud.weebly.com/uploads/1/3/0/7/130776562/3963845.pdfIn PDF document text
    • https://cdn.sqhk.co/diwewiduvaz/QxggihF/kitililogusoj.pdfIn PDF document text
    • http://trokot-online.xyz/bengali_horror_books_free_downloads4wg0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414167/normal_5ff2f0bb03743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417138/normal_6009d77e69e23.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hTZK0ie/43669311661.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/piximanakawugagomemo.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/390431.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/aAic62g/alluvial_diamond_mines_in_south_africa.pdfIn PDF document text
    • http://yourlivehelp.com/59716741549yk3pd.pdfIn PDF document text
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/xarajevinis_kixamadojojexab_vatozalipa.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/jiij10C/magic_tap_tiles_piano_edm_music_game_online.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/kanda_sashti_kavasamvlqk1.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/hiheZie/pofedipunozi.pdfIn PDF document text
    • http://mamajan.space/fadafowanunorakikuxe0b6.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/idmo5Jj/rapije.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/03jhjaY/50130661902.pdfIn PDF document text
    • http://silvanozito.online/359615658909kf1f.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/3uLrNww/vokosexipobiwasiwuno.pdfIn PDF document text
    • http:///\/www.bbb.org\/chicago\/business-reviews\/industrial-equipment-and-supplies\/power-equipment-direct-in-bolingbrook-il-57001088,title:SnowIn 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://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_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 5280 bytes
SHA-256: ae22f82cf6a24b8900050198237fd6b08b5c95950b719d380ccf68e39356cd20
font_01_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 13056 bytes
SHA-256: d06062fb2e3c6409d5e563f1af16126b359982f67ed577cf562592be499bc6ed
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71