Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f96ff7446f3da71…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 10:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 154f96b978dd488bcc5a3397df661bc0 SHA-1: f88fc958c136c8a2889a54b94f47559190e42db7 SHA-256: 7f96ff7446f3da7141e2c3dad4bf806a48b254ad0f08146f4c1fb4940d8182fb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an image-based lure, a common tactic for phishing or malware delivery. It embeds numerous URLs, including one pointing to 'infrive.ru', suggesting a redirection to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=bleach+offline+games+for+android PDF link annotation
    • http://oilspecchem.com/files/sajixazomenatozoku.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75a945463---pilos.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090600304285.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/milujuvinixubusa.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/63231881236.pdfIn PDF document text
    • http://superazs.ru/images/news/file/zuvowizitiremowesi.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/panoliminenobugali.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/wutowabaputelen.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/sidibamuvol.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/94583677696.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/22635641465.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/27169938081.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/gezufekumofiwusujibager.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/87669834590.pdfIn PDF document text
    • http://lgassociates.in/uploads/nisivuvatoz.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/bafim.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/22253914906.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/5593555681.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/73145276029.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/96759354461.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480626eb882---69572643757.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/58343201729.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/80201117410.pdfIn PDF document text
    • http://hiniceshine.com/upload/28051897525.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/depuresotigoxatolorojo.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/30811757534.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_off0000aff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF6 10876 bytes
SHA-256: 2e3e1c46f93b96a8614d2c9f89f3c373e27a486f85a97eaae594698555550249
font_01_sfnt_off0000c8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 14148 bytes
SHA-256: 25041b05d20d3274c5a2b50f32104657a52f7991f2f827a8ae1e6348d1089247