Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd562a85701dee43…

MALICIOUS

PDF

94.8 KB Created: 2021-09-23 23:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d607c830db036905ecdb545b8b3eecb8 SHA-1: d723811e37283a722bb4019f662ef03688e1b95f SHA-256: cd562a85701dee4368ea7d717056d9ae91c0822c337e0201bbb9dca0b0afbeea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs, with one notable example being https://crewmak.ru/uplcv?utm_term=suicide+squad+full+movie+online+watch, suggesting it acts as a lure to external content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm designed to redirect users, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=suicide+squad+full+movie+online+watch PDF link annotation
    • http://quranday.org/userfiles/file/66086870059.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/57291bf05abed3671462960a1c24c3dc/bofupiriruga.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/67509263480.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/15488718573.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/zolubutibuz.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/masatid.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/450303_tuwejixof.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/sanijanidebemisaki.pdfIn PDF document text
    • http://zgic.ru/!upload/files/20970726809.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/51270363734.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/fakoxovubuw.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/negatitovojiwiwabo.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/wabuwomobev.pdfIn PDF document text
    • https://hobbypet.cz/files/file/79849716133.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202197122212644.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161390aaf1edf0---42500732653.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/83995050794.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/3323645325.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/20732796410.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/81957076386.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/kikapozivijezo.pdfIn PDF document text
    • https://felicityokolo.com/file/97929236742.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109201846205223.pdfIn PDF document text
    • http://ladna.pl/user_images/file/tifaw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 11116 bytes
SHA-256: acf0d27bd4d44c3d78b85353a02aa264d80f850eaaa3efde6efbe2e5d636dce0
font_01_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3E 19220 bytes
SHA-256: a6fdfa58eaf150fa291cd79dc466d4188ddb4e3b3650a8a30f8b6402dc60a484