Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1ba4df94206b55…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 18:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 054c36f46d8037a2cf124ee8127b5813 SHA-1: c278f3a1fb05b70d141fb0d7a69004d0a19519c2 SHA-256: 5c1ba4df94206b5561bb7f315cee09bbf90297506d06ef06224f38ac09aa4972
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with a high-severity heuristic indicating a link farm on disposable hosting. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to redirect the user to download further malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chameleoncoupons.com/adgprocessing/uploads/files/bulizaweralusupato.pdf
    • http://cjatkinson.com/userimages/94408129085.pdf
    • http://ap116.ru/userfiles/file/45629708637.pdf
    • http://eminenceinc.com/userfiles/file/gesatobinesulafi.pdf
    • https://takitech.hu/userfiles/file/korofowurukererazelavo.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/85183954569.pdf
    • http://otestmanager.com/club/data/userfiles/file/20210909161135.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/migivijodujuferumurese.pdf
    • http://danchrisjewelry.com/userfiles/file/42713258920.pdf
    • http://lunaleo.pl/userfiles/file/devipul.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/rigelevenudo.pdf
    • https://bitree.ru/ckfinder/userfiles/files/5576013982.pdf
    • http://industrialdevices.in/uploads/motaferika.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348fa1c4e90---69523422192.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/49602081876.pdf
    • http://king-tableware.com/uploads/files/202109072002084470.pdf
    • http://gs-metals.com/filespath/files/20210904145311.pdf
    • http://usairsprings.com/userfiles/file/249271459.pdf
    • http://jingyilin.org/uploads/file/wejixoduvawazasozis.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/67747682328.pdf
    • http://olympicthesportshop.in/uploads/72565565386.pdf
    • http://koreabulk.net/userData/board/file/72129141537.pdf
    • http://chromowane.com/userfiles/file/xogobasafu.pdf
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/rowowidagabem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+witcher+monster+slayer+android+download
    • 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_off0000d27a.bin
9edc7dad65f8b03f095665e5b84d5687231582bb6b5e3d001ca6859a6af98495		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 17360 bytes
font_01_sfnt_off0000ff5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 16792 bytes
font_02_sfnt_off00011771.bin
28afa625773a00fef5f4069e2d1421c906d05a249a92104c18539b1d6a848c84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 10800 bytes

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