Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ed395900c229a1…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 02:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9a15b9ad380af11422c2e3d53960447b SHA-1: b8dd9db346cc340e1df9d1c388c6ace177f97b17 SHA-256: a6ed395900c229a1ab89c4d4f3192d5bdf3045a5dc0fa23310bef2cc123aefa6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which are part of a link farm designed to obscure the ultimate destination, a common tactic for phishing or malware distribution. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://hanart21.com/files/userfiles/file/82155538814.pdf In PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/7129304285.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/83954030819.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/65027120212.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/nixipewenepaxujupemenoge.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/95388500444.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/bujibam.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/60910454817.pdfIn PDF document text
    • https://rubfila.in/files/file/47860166716.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/nizefaxizowalu.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/17229806811.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/nirazigodidozibazufosezot.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/77654026006.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/50570222093.pdfIn PDF document text
    • https://defi128.com/userfiles/files/6479288149.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16131f9222ed29---tisujafuku.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210911122450.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614200badda90---34272948012.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/48753603524.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7db9e9a97---titoseri.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/vuvadetuled.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/58718459775.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/74702632170.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/jafiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=evie+launcher+apk+downloadPDF 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_off0000bbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD8 17748 bytes
SHA-256: 0b7b3a94c2fb4bdc9ce4b801d57debd7b05ee3e4da3ab68bc6eb6233ef94adb6
font_01_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 10672 bytes
SHA-256: 20ed739faa486acbd960f277ef0c7904503cb1b2e92e089cc63e8b8b62917382
font_02_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1