Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa376a1b08750c4c…

MALICIOUS

PDF

77.7 KB Created: 2021-02-27 00:30:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 49d7428b42e85693e18ed103f784f405 SHA-1: 825b700a505656b2c9c24ad207fa97ce32f09397 SHA-256: fa376a1b08750c4c92d1800b80aecacb51307be2ddec945e05501e22c24a083c
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains multiple embedded URLs, with a primary suspicious URL pointing to a domain associated with malware distribution. The document body, though heavily obfuscated, contains references to software downloads, reinforcing the lure.

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://gimoguvi.ru/strik?utm_term=sketchup+8+materials+library+free+download PDF link annotation
    • http://dagoseguvidita.22web.org/pdfzorro_editor-_files_online.pdfIn PDF document text
    • https://wepopoxewu.weebly.com/uploads/1/3/1/1/131164118/pokapazexijituxijej.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/2302883.pdfIn PDF document text
    • https://rusijarumeza.weebly.com/uploads/1/3/1/8/131871651/nivanagari.pdfIn PDF document text
    • https://zegimobigew.weebly.com/uploads/1/3/4/3/134313375/61862c2b2.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/13514572909.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/is_autocad_3d_software.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bologipegokofi.epizy.com/barbell_squat_form_tips.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/94444758452.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/37627765653.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/the_expanse_season_4_episode_1_summary.pdfIn PDF document text
    • http://mefugoniwiw.epizy.com/netgear_ac1600_wireless_modem_router_d6400_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/pozotalag.pdfIn PDF document text
    • http://puloxivomavari.epizy.com/purple_flower_wallpaper_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/battle_royale_apashe_song.pdfIn PDF document text
    • http://xetafenup.rf.gd/xasujojojezu.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_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 6088 bytes
SHA-256: 5465fa050bdbca7ea7c9884f1da8b1ecfbf51c96f7e13696e22e72178a9ffed2
font_01_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 10252 bytes
SHA-256: 8d87633cd45c7083a757ee01e0c3bb5e084696431f2798e876dc3d75634d9855

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