Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8e4cea3122cfe0…

MALICIOUS

PDF

76.9 KB Created: 2021-03-29 00:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a879ae30dcd3dc3331acb57da20719c7 SHA-1: 1a7e934b36977bacc64d015d81d44d9ac4b00d9e SHA-256: 8c8e4cea3122cfe057e815787fb8286a17a4684e0790e11621a54a4c9fb6d17b
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, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=does+utah+look+at+weighted+gpa
    • http://circus.market/face_mask_3d_model_downloadoi3tj.pdf
    • https://cdn-cms.f-static.net/uploads/4368223/normal_600c51f9d6a57.pdf
    • http://13millions-warzone.store/the_unit_circle_degrees_and_radians_conversion_practice1tc72.pdf
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5ff61889a1af5.pdf
    • https://cdn.sqhk.co/rexukewanej/iiigfBw/black_cobra_hd_wallpaper_download.pdf
    • https://cdn-cms.f-static.net/uploads/4454550/normal_602834cb7d433.pdf
    • http://krokoboko3.xyz/mogumuxogorepikaritepesuz1qun.pdf
    • http://qwert-ita.fun/49102697430ne6u7.pdf
    • https://cdn.sqhk.co/dilujuzaga/vgij4ji/cover_orange_2_level_7-_11.pdf
    • http://begemotiks.fun/marketing_and_communications_manager_job_description_sampleurems.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • https://cdn-cms.f-static.net/uploads/4388038/normal_6015b77cbf8ee.pdf
    • https://cdn-cms.f-static.net/uploads/4417321/normal_5fd285b4cfff4.pdf
    • https://static.s123-cdn-static.com/uploads/4410030/normal_5ff8ad18c151b.pdf
    • http://klossheff.xyz/8616135257fwqz5.pdf
    • https://cdn.sqhk.co/xezalagefog/lgGiutE/wireless_bluetooth_earpiece_for_android.pdf
    • http://matcobzor.ru/omron_hem_650_wont_inflater9t84.pdf
    • https://cdn.sqhk.co/feripamapuv/gjiiSih/21073998507.pdf
    • https://cdn-cms.f-static.net/uploads/4475577/normal_6025888a2891a.pdf
    • http://nutristrike-shop.ru/78967217975y26gh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_04438d8d63704a26a85fd4e871b7f2ee.pdf?index=true
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_6d08be07559e4c80b71c5890b50acc84.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1af.bin
de30800fd49f519f598fb4dcd43ba4555aef9160d4c235830c6521297345098e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 5056 bytes
font_01_sfnt_off0000f308.bin
26d648a662aea5cdf33b6a6c344520c3a84bf27947ba581f6f2e69f895e0b09b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 10880 bytes
font_02_sfnt_off0001183c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 4324 bytes

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