Malicious PDF — malware analysis report

Static analysis result for SHA-256 6526bb1bc8feee7d…

MALICIOUS

PDF

70.4 KB Created: 2021-02-25 15:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4ad5e76ed7c25e52b8e89c810b93f95d SHA-1: 5a58ee638ced71306a8f18b85395a06563caef9d SHA-256: 6526bb1bc8feee7d71ec6a45969a71fd80574f24604c9dce028462d511cfb150
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains that are likely used to host further malicious content or phishing pages. The document body, though heavily obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=comma+splices+worksheet+siuc+writing+center+answer+key PDF link annotation
    • http://zizodoroluxonaf.sportsontheweb.net/25972894349.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/how_much_is_a_pole_vault_pole.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/acido_nitrico_estructura_quimica.pdfIn PDF document text
    • http://mebel-albero.ru/texas_hold_em_winning_hands_chart8v6kr.pdfIn PDF document text
    • http://lnstagram-helping.live/blank_sheet_music_4_4_timerlte4.pdfIn PDF document text
    • http://basvuruizleme.online/566653535827efo3.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/iBHidih/road_trippin_tab_bass.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/merakafomim.pdfIn PDF document text
    • http://airbin.top/bewubaguzokatsg651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_5fd836e996588.pdfIn PDF document text
    • http://meriline.store/bhoot_fm_special_episode_fusionbdk34ow.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/the_wind_in_the_willows_1995_cast.pdfIn PDF document text
    • http://top-odejda.com/25415170642nudj9.pdfIn PDF document text
    • http://gladkoe-telo.xyz/lawaratolutep7f8fn.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/walusuvesakifatix.pdfIn PDF document text
    • http://euromarket.pro/fexesojarobilemipuficksut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tefetuzuzip.myartsonline.com/4736632715.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_off0000d579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD579 5508 bytes
SHA-256: 97eb6851037e30078ae29b77769c22b3394204943ad259cf60e2f5c04e77bf83
font_01_sfnt_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 10596 bytes
SHA-256: f523cf164fd7d96b5ef2f6e0292cb8839b29acb8f2642acf49d379e0c98da341

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