Malicious PDF — malware analysis report

Static analysis result for SHA-256 af859ad6fbbecab2…

MALICIOUS

PDF

95.6 KB Created: 2021-09-16 13:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c3021f1c16e1f76d82e884b1d280ae2 SHA-1: 8f7df448211caee462e4656baa8a4ce8c8cf622e SHA-256: af859ad6fbbecab2ab3229bec70864cd78f7b36536935160e4b44c8bedc09fed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and act as a link farm, suggesting a phishing or malware distribution scheme. The presence of a URL with a 'resident evil 7 biohazard free download' term indicates a lure for potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=resident+evil+7+biohazard+free+download+for+android
    • http://agedwedfjtj.pretty-match.com/upload/files/34580485418.pdf
    • http://iuf.kr/pds_down/files/76009750633.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/511e5119b2e20c67d6fc8dfd30e183a4/27973743282.pdf
    • http://epilia.com/upload/FCKEditorfile/36301322028.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161413dcc40ac9---8378429083.pdf
    • http://thaiboxes.com/piceditor/file/14287443142.pdf
    • http://fine-cottage.ru/userfiles/files/40447677630.pdf
    • http://lagostena.it/userfiles/files/10420646896.pdf
    • https://architektor.ru/uploads/file/pugogunixegerolo.pdf
    • https://hoatuoi360.vn/uploads/files/jigatu.pdf
    • http://ersatzmonitor.de/userfiles/file/29901696609.pdf
    • https://larrialdiak.es/files/galeria/files/kevuxemitajufag.pdf
    • http://zdrowejaja.com/Upload/file/bivukitadajazawafeba.pdf
    • http://cinebuzz.be/uploads/userfiles/files/vurizekorolawezid.pdf
    • https://fontaine-eva.fr/userfiles/files/fetifepimemefuwikofaniz.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pukerefa.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/goxopoju.pdf
    • http://nguyenphat.com/public/default/ckeditor/files/12119662033.pdf
    • https://omprintandpack.com/userfiles/file/57324512701.pdf
    • https://samudra99.com/contents/files/22974745824.pdf
    • https://terminarz.online/kosmetyczka/krakow/files/nuwegudexuga.pdf
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/dejidinutevopuwexovunuzi.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_off00010de9.bin
5511e077ca2b046446658ade466fc020ea2ecd749861d69cf43502ace263d4fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 10900 bytes
font_01_sfnt_off0001272b.bin
5e38bf46e279c18ee1461addea2ff5e6778ccca944bd20ea96ef2a1f8ca634d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 19144 bytes
font_02_sfnt_off0001586b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1586B 16792 bytes