Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2d99da4fb9769b…

MALICIOUS

PDF

77.2 KB Created: 2021-04-29 08:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c6261e004bb4bb0de0d16b0c43c573b SHA-1: bd1c2efd83c482577c39c69ebc2512d9b16ea34b SHA-256: 7f2d99da4fb9769bf62c1bcc18c560868224145a5d2899baa92ee73615bcc105
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs, many of which point to disposable hosting and are likely used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting an attempt to obscure the true destination or spread malicious links across multiple domains. No scripts were extracted, but the presence of numerous suspicious URLs points to a phishing or malware delivery attempt.

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://nipisod.ru/strik?utm_term=is+hiit+considered+weight+training
    • https://cdn.sqhk.co/pizokifuxe/fibmhbw/dynasty_warriors_4_equipment_guide.pdf
    • http://palubofapejuraw.mywebcommunity.org/tajivisikukemoz.pdf
    • https://cdn.sqhk.co/motakolilo/ghqVdkS/niribaxobim.pdf
    • http://zelumefepa.sportsontheweb.net/zufonofot.pdf
    • https://cdn.sqhk.co/kerosumumato/bjjshir/auto_swiper_for_bumble.pdf
    • https://cdn.sqhk.co/kifukuvitog/cmTYjfx/tower_heroes_codes_mejoress.pdf
    • https://cdn.sqhk.co/fosuzonarefi/jfPibU4/94913019643.pdf
    • http://gamukanemafutu.mywebcommunity.org/94527952630.pdf
    • http://fuzubijixulux.mygamesonline.org/merry_gentry_a_shiver_of_light.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/63637dbf-7dce-4564-93cd-4982416ab964/zarefutezagi.pdf
    • http://vifidumefitur.atwebpages.com/illinois_apartment_lease.pdf
    • https://b5f62e6e-b620-4b0e-90dd-fa81fc7fb5c2.filesusr.com/ugd/18d815_b253af0ce0214b998b3a51f43e73d81f.pdf?index=true
    • https://s3.amazonaws.com/fatisake/puffin_web_browser_pro_apk_mirror.pdf
    • https://s3.amazonaws.com/zaxefemebidaz/how_to_get_consumer_cellular_sim_card.pdf
    • https://uploads.strikinglycdn.com/files/be4abc8b-4a83-4b51-ad0a-2abe5100048e/jbl_flip_3_battery_life_problem.pdf
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_36155a6a4d71468fb395cdfca24b9cfd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d1cbc059-87ca-421a-8974-3cd8488bf877/dutif.pdf
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_0db6242dfb164ba6b2467d6eca307612.pdf?index=true
    • https://s3.amazonaws.com/libusamagowuvo/75662727909.pdf
    • 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_off0000f1fa.bin
d0b470810b472d6f092ca2986fe3c31cd7e83cda5948fd0a336b8d41d924c3b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 5200 bytes
font_01_sfnt_off000103b5.bin
69c48c3bdb20257f8cb4ea55627ba59bf4759a618b0805e68c441ad1902d8bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 10652 bytes

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