Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a728c9cbc04a42…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 08:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 789555c0190d68324d9e06c42905306f SHA-1: 9bc8ff0f13a2ea1efd2d4d265f249327993262f3 SHA-256: 04a728c9cbc04a42f89d52fd830af026ac717959b2efd27527d62d0777aa4d7d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous links to external PDF files hosted on disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' further supports the phishing pretext by indicating the document contains invoice or payment language designed to prompt user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=how+to+record+call+in+redmi+note+9+pro+max
    • http://yeosingol.com/FileData/ckfinder/files/20210904_0DCF5F3E1C756A1B.pdf
    • http://svsteinfurth.de/radsportfiles/file/58509562298.pdf
    • https://muzpony.de/obrazki/file/mosorawevapuf.pdf
    • http://ourdesign.hk/ckfinder/userfiles/files/vizer.pdf
    • http://evolutionchonburi.com/userfiles/files/bomowalafusezegisumud.pdf
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/gitokijerixesok.pdf
    • https://libertyrealestate.in/ckfinder/userfiles/files/8619853760.pdf
    • http://claudiamelchior.it/images/file/79197016180.pdf
    • http://ailizia.com/userfiles/komejizulemesugugenevex.pdf
    • http://ilkemymm.com/image/files/latajuvurigulukesaweweb.pdf
    • http://kammatrans.com/userfiles/files/44920713664.pdf
    • https://sakkestadbil.no/userfiles/file/61447459289.pdf
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/87822635366.pdf
    • https://nirkongrp.com/ckfinder/userfiles/files/11813546469.pdf
    • http://allier-genealogie.org/File:/damazo.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff2765dc5---32121650939.pdf
    • https://riminabda.sk/userfiles/file/jevenalabuduturulasinibez.pdf
    • https://kisikana.hr/userfiles/file/86580242197.pdf
    • http://mazraeir.com/images/upload/files/denosovevutofebimu.pdf
    • https://markyatirim.com/resimler/files/fewojovudid.pdf
    • http://hwayinn.com/image/files/20210907_034744.pdf
    • https://keongracun.org/contents/files/38924594445.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5B 16792 bytes
font_01_sfnt_off0000e372.bin
73e94c752055a9d7b95f1b7f1d8c66d6ebd23e13b3652c83e6650aff77d2baeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 10856 bytes
font_02_sfnt_off0000fc7b.bin
f62c00f4bafa71ba8c4493e51d63878f8f240b353002fc3e1a38dfaaa35c1c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 17508 bytes

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