Malicious PDF — malware analysis report

Static analysis result for SHA-256 accbbf41fec0f9fa…

MALICIOUS

PDF

71.7 KB Created: 2021-10-03 07:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d440bfd2fe27995d4bcc9d1d3007abe7 SHA-1: 88df3d828ddcb4a90ed74f75977057e312f61303 SHA-256: accbbf41fec0f9fa0286db98d61ab5d053fa766c17b01ec38324fb3553e917ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://matchedtubes.de/userfiles/file/tuvikatemoxowaboza.pdf In PDF document text
    • http://rsentco.com/upload/file/fenuzose.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/70551076927.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/52808069354.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/lalulu.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/39776442542.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/41461746200.pdfIn PDF document text
    • https://foulardfotografando.it/file/25191467417.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/zosibovizojorumif.pdfIn PDF document text
    • http://perksys.com/userfiles/file/ruxokotizemezavajo.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/41301366280.pdfIn PDF document text
    • https://seikai.jp/free_images/files/26994791334.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/14805967342.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/77980764656.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfb9296012---bidezuwerupodubu.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/33241029059.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615834b7ae248---36713401571.pdfIn PDF document text
    • https://lasanisports.com/files/29868114377.pdfIn PDF document text
    • https://successalpha.team/upload/files/zotigonumap.pdfIn PDF document text
    • http://lachina.cn/upload/file/174212229.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/dadavu.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/15397662385.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/10097696100.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/supibibedi.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/71647478013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=s+pass+and+work+permitPDF link annotation
    • 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_off0000b574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB574 10760 bytes
SHA-256: 11985e62bd1d55534ff277d20146cde2bb995a75453bec82f5ac9abd161047be
font_01_sfnt_off0000ce3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 16796 bytes
SHA-256: b22ae8f7ee6a023379668ab7dac037df429bdd8ee2fa97089eb3cfa37c87ce06