Malicious PDF — malware analysis report

Static analysis result for SHA-256 67aee125fcfe3e62…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 01:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81158f261352b710ab0ed3e6778a7a9c SHA-1: c5d3dbfd56da8287651a9655689377e64edfa640 SHA-256: 67aee125fcfe3e62b0690834baf9398d1cdcf545e26ceebc777bfbdcfe568075
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains a large number of external URIs pointing to disposable domains, a common tactic for link farms used in phishing campaigns. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://farmacieitaliane.com/documenti/file/karifov.pdf
    • http://synfarm.com/upload/files/dolegugawegukosagazegu.pdf
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/rigopiwazojel.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/nchh2ktucmtohg4sv0dah4jj4d/zegapoxemutufosugurunewaj.pdf
    • https://heatingboiler.ca/fck_upload/file/lifovufatitulonu.pdf
    • https://arte-salon.ru/upload_picture/suxosagirokanisutut.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/fobajurijemibeg.pdf
    • http://asupuro.com/user_data/image/file/56139989923.pdf
    • http://fapannimario.it/userfiles/files/78844757682.pdf
    • https://vegas-shop.net/uploads/files/71283912934.pdf
    • http://toyotaquangninh.org/data/dulieu/files/93129684437.pdf
    • https://associazionedynamica.it/uploads/file/fiwarunafefalux.pdf
    • http://tofuyatogo.com/uploads/files/ginezosokufarefasogo.pdf
    • http://druckmaschinenservice.com/uploads/fce/files/miwofe.pdf
    • https://tommytest.dish1314.com/data/html_editor/files/wezil.pdf
    • http://studiomanzella.com/userfiles/files/64328568470.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/99316973927.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/86843510919.pdf
    • https://isleo.com/i_photos/file/kupavofetepuxafez.pdf
    • http://dokturmice.com/ckfinder/userfiles/files/16846692062.pdf
    • http://nieruchomosci-swidnica.pl/userfiles/file/ganaz.pdf
    • http://4bx.pl/public/file/51169111474.pdf
    • http://80tner.netsociality.com/upload/files/doxugadovigonakusokanovor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=screen+size+of+m30
    • 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_off0000dacc.bin
33f0008377dd03e886071146062bce969e764d8d1abf7f038a46818e09333608		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 10620 bytes
font_01_sfnt_off0000f313.bin
107b62d8c595f7c4e106d3e48ee57b0f60823c8781ae1c926faa6d30575a8561		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 18572 bytes
font_02_sfnt_off000123a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 16792 bytes

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