Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0f0553fe146264…

MALICIOUS

PDF

90.7 KB Created: 2021-09-13 10:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 411d3fbfce34e8fb74b81ea24c1939d9 SHA-1: 6052f1ce5e45b1d60fc5d1b0fa2d14f8e1b74af7 SHA-256: 4e0f0553fe146264f77f7ad3e52d4e705ee10bb686d7d42f8f347ef155c485f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, directing users to numerous distinct hosts, one of which is http://119pump.net/d/files/pulajajigiwud.pdf. This behavior strongly suggests a phishing or malware distribution attempt.

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 http://119pump.net/d/files/pulajajigiwud.pdf
    • http://technoprofile.ru/userfiles/file/5705526584.pdf
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630617707_3efb6fb12d.pdf
    • http://gloria-eurex.com/images/blog/file/gusifakupukanevovujej.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/334bc7b4e9c9310fa40b7821366492aa/35461723710.pdf
    • https://lasanisports.com/files/29868114377.pdf
    • http://jingyitech.com/uploadfile/kowinodekekozutaxa.pdf
    • https://makenie.com/upload/files/7610579602.pdf
    • http://polins.org/public/userfiles/file/xamefobaxiwerez.pdf
    • http://turksebruiloften.nl/userfiles/file/53545921102.pdf
    • https://galerieportelouise.be/userfiles/files/mafilumav.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133192eca51b---fidegawuvotasekose.pdf
    • https://doctmcooper.com/userfiles/files/15810879982.pdf
    • http://hyeminshop.com/DATA/files/75643236897.pdf
    • http://ranjitabiswas.com/userfiles/files/jexejovizujovev.pdf
    • https://nieruchomoscikomercyjne.co/files/file/40767165643.pdf
    • https://autonoleggioassereto.com/file/kuvafum.pdf
    • http://sisparts.pl/zdjecia/fck/file/raselekuzufisoxuri.pdf
    • http://liavanhaeringen.nl/userfiles/files/kexipema.pdf
    • http://diegogenna.it/userfiles/files/9974138195.pdf
    • https://newdesert.pl/userfiles/file/xokesifagibometiwiwax.pdf
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/50391916658.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=largest+country+in+the+world+2020
    • 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_off0000fd31.bin
7b35304d48ab5fe4ecc891d9b8d60e430b7457c81fe64ac24035ab83ec59f5be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 11148 bytes
font_01_sfnt_off00011717.bin
56ff6b08f687e78356e1ffb3a9683e5fa08b011985e58355925f893a31f27dd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 17696 bytes
font_02_sfnt_off000144e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144E0 16792 bytes

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