Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d981a9216814e9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 19:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89be67ed7509470b6142c342669b8a9a SHA-1: 494227111fb7cbc8f6a6846fe6253cb1a0db4ea1 SHA-256: 04d981a9216814e9a94ae6f7c91410a9cb0b1e48a855793f3f21a95f01d165fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to external websites, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=minecraft+story+mode+apk+free PDF link annotation
    • http://pacemakerpressintl.com/uploads/assets/file/50077418075.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/76204792191.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/99840263316.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/7131537538.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/xubimikubebijabomof.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/20913659392.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/52472919570.pdfIn PDF document text
    • http://vln.nl/files/file/97902128271.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/92417801017.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/93008389616.pdfIn PDF document text
    • https://chineseclothingonline.com/File/waxurabitatijobir.pdfIn PDF document text
    • http://selidbe-beograd.info/files/26747909783.pdfIn PDF document text
    • http://blueyee.com/upload/file/041204109639.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/siximegikula.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/zuduvusibexezutivof.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b5743e9f029b71b9be8971d054d084e7/lamulewurivokon.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e895b0c3c---fifojasavezi.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/36082967500.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/xazevusadosub.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/96392789348.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/1283140075.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/58717665788.pdfIn PDF document text
    • http://taociren.com/upload/file/210912185258461002gmzagtga8agi.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0196520001631135984.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/65847421967.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_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 10936 bytes
SHA-256: 8403466a870cff21bea0c0de792887986138d73a7731dd4f5d37810e5eba7d79
font_01_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 17320 bytes
SHA-256: ce1f7a8b04314ba1307f7d880d5b8c6ea5974a9c8f3a7ca3a5b9d09e0ed5c6ba
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1