Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6713cd5e597627…

MALICIOUS

PDF

76.0 KB Created: 2021-03-14 12:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05ead40312b5db31645fa27a661bb78a SHA-1: 42583801b0ab2cc284299d3d415a7060af898b7e SHA-256: bd6713cd5e597627d0fc6601d30fefa959ddc5328dcfdaed0d7b709bd6bff00e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=antioxidantes+enzimaticos+e+n%25C3%25A3o+enzimaticos+pdf
    • https://cdn.sqhk.co/xovikojux/igc0Nig/dynamons_world_2_mod_apk_hack.pdf
    • https://cdn.sqhk.co/mugodetutag/ghm2xhq/smash_hit_game_modes.pdf
    • http://datingsexchat.site/wuputepapedijuma3p8b.pdf
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5ffb42bf85916.pdf
    • https://cdn-cms.f-static.net/uploads/4423148/normal_6018cd7ded598.pdf
    • http://ig-about.net/vudemogisixugijojijs079g.pdf
    • https://cdn.sqhk.co/nupepewomaxu/gg9ghhe/mcdonald_s_covid_hours_uk.pdf
    • https://cdn.sqhk.co/xetosusaxi/ijjajjE/61327770619.pdf
    • https://cdn.sqhk.co/pisomuma/kUijjJ3/dragon_quest_8_3ds_walkthrough_ign.pdf
    • http://uscovidcharts.com/bose_color_link_not_pairingysgby.pdf
    • http://cybety.xyz/tkb_pendidikan_agama_islamlqfbc.pdf
    • https://cdn-cms.f-static.net/uploads/4410418/normal_601f83170c88f.pdf
    • http://drilltech.info/nepimizapiworedoduximef3qn.pdf
    • http://salebox.shop/84014280922a7kz6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tepominofujemo.atwebpages.com/arteri_perifer.pdf
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_003fcdf1525c4b659d41a8285e96afbc.pdf?index=true
    • http://kapowuxivi.atwebpages.com/old_mans_war_book_series.pdf
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_f8956421c6cd412ca2238dfc724d94da.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e672.bin
97c360e74ecf050fca7f22f7f589895bb5d4cdc1811665f06edfbfcec0699366
pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 5600 bytes
font_01_sfnt_off0000f8ed.bin
7812933759f6bea67bb061125cb15cb121d757d802f342c3d27488d7502fd701
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 13016 bytes