Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f8d97ea3ddcb9c…

MALICIOUS

PDF

80.5 KB Created: 2021-03-16 23:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f24d767ac5042ab6021e2b9543f9dd7 SHA-1: b48e5425bc3b98ff88185d86ff24c6cf310b45aa SHA-256: 72f8d97ea3ddcb9c147d44039c4acba6fa5122a65c2e8fe6fc92bbeeea91e35f
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 flagged as a phishing trojan. Heuristics indicate it functions as a link farm hosted on disposable domains, with numerous external URIs pointing to potentially malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/strik?utm_term=mixer+yamaha+mg24%252F14fx
    • http://sravniproxy.info/difference_entre_pit_bike_et_dirt_bikejavsn.pdf
    • https://cdn.sqhk.co/fegadosijete/ihCDyjh/24440255124.pdf
    • https://cdn-cms.f-static.net/uploads/4492900/normal_6019873cbaad3.pdf
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/3157591.pdf
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/tomepuvinugeza.pdf
    • https://lisufijefe.weebly.com/uploads/1/3/2/7/132740260/vozun.pdf
    • https://cdn.sqhk.co/sanevujaguda/r0ZLOih/required_run_rate_formula_in_excel.pdf
    • http://verifybadgesbusiness.com/2001_international_4900_dt466e_specsj9wsa.pdf
    • https://cdn.sqhk.co/tasaxasup/ggJYib0/color_jelly_bracelet_meanings.pdf
    • https://cdn.sqhk.co/kegufamop/jfiUOMk/88216328662.pdf
    • http://trynon.xyz/nadurubefudenogoxijogabr6s9.pdf
    • https://cdn-cms.f-static.net/uploads/4407996/normal_603eb876db33f.pdf
    • https://cdn-cms.f-static.net/uploads/4484126/normal_60289b7708ae1.pdf
    • https://cdn.sqhk.co/pananele/jRAjjhf/hanuman_ji_ke_bhajan_dj_song.pdf
    • https://felonuwonab.weebly.com/uploads/1/3/0/8/130814100/mobisuzakupopofipozo.pdf
    • http://vorecan.space/la_historia_de_julianq3a1w.pdf
    • https://cdn.sqhk.co/badilapo/szjdjfU/gunship_battle_total_warfare_forum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_efafa27745684a81b0fff8d517230dfe.pdf?index=true
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_49df68fbdf39435d97bf13c359227156.pdf?index=true
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_26ed8e01d17f40528ee1ea88b2195e9f.pdf?index=true
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_2f9bf08d72094279aa8c9ebec6dc544c.pdf?index=true
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_9df3805c03194fb4bb7d64bf42021e94.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_off0000ed1c.bin
e708c1a10f7b072d21b7bec5762c0eede56c3422d4a201c5532ece55b2011eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 4944 bytes
font_01_sfnt_off0000fe0a.bin
eb14946048063726546482f1ec2d4e7a2415437d813812e8ce60a16d9eea59c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 11600 bytes
font_02_sfnt_off00012554.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12554 4324 bytes

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