Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff9881501c7a6de…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 06:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee1e93aa12c69b68644a20513999f45c SHA-1: e143daca5f7e25941e8bcf35473ee661f58732fe SHA-256: dff9881501c7a6de95a1154c600e2b59b8ec8f4b0ecbefc449e46005510db47a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and ML classifiers as malicious. It contains a large number of embedded URLs, many of which point to disposable domains or are used in a link farm configuration, suggesting a phishing or malware distribution attempt. The PDF's structure and the presence of numerous external links indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=fastway+iptv+channel+list
    • https://asken.as/bilder/file/rowulelutisuxeludokefevu.pdf
    • http://olivetheater.com/userData/board/file/pusez.pdf
    • https://cleanenergy.mn/uploads/files/buvikosezokele.pdf
    • http://ipai-bg.eu/img/file/1054912157.pdf
    • http://syntrend.critical.tw/upload/files/tirofulu.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/wunubiwa.pdf
    • http://pho32shabu.com/uploads/files/zukupilepusufemagujaxibir.pdf
    • http://teraval.cz/res/file/vubaxixokijeson.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/ruregekud.pdf
    • http://cinebuzz.be/uploads/userfiles/files/311272177.pdf
    • https://sieuviet.net/webroot/img/files/37679993131.pdf
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/90567612377.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/xovapimula.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148afb164513---sudewozavobagilobepe.pdf
    • http://wmc21.com/ckupload/files/78041082680.pdf
    • https://coevent.ru/upload/files/87848022250.pdf
    • https://listapp.in/ci/userfiles/files/56204206424.pdf
    • http://qishuochem.com/siicea/userfiles/file/wunumifes.pdf
    • http://asbazainville.org/userfiles/file/84220964420.pdf
    • http://suchanekstomatolog.pl/files/file/52280188081.pdf
    • http://sinosteelcode.com/filespath/files/20210921051624.pdf
    • http://akcjonariusz.com/UserFiles/file/915194266.pdf
    • http://auburn-properties.com/userfiles/files/revotevataku.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_off0000d472.bin
569057dba43b4d24c8ee12ff3789064c04a327c471e96b82864363b9bbf41490		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 17728 bytes
font_01_sfnt_off000102ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 16792 bytes
font_02_sfnt_off00011ae5.bin
9ad7fd7d033beeee7ca929024847e3aed8d3ef2d8b8c81c2c8f41c244cd7fca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 10496 bytes

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