Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad6cd0ae998e7e5…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 06:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d38c5f15a60a56f84a590553b32cf94a SHA-1: d30d73e21b8d28ab4edbe4ecdb0711dcfd2894a7 SHA-256: 9ad6cd0ae998e7e544fd5d1ae1a6b1da736cd6ff4e25ca15237a46399c9fa20e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely leveraging T1059.007 if JavaScript is used internally for obfuscation or redirection, and T1566.001 as the likely initial access vector.

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 https://queure.ru/uplcv?utm_term=action+director+apk PDF link annotation
    • http://autosoftware.company/autoresponders_images/files/98706282.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/fukiwizila.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/2250189713.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/koletivejimutivo.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/29184288020.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/nuresofomoganaw.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/72870870646.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/botuvosereduxugop.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/4098271770.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/44170714475.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161422895a2d1a---bumasi.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/sozewununironoxeguno.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/64992921538.pdfIn PDF document text
    • http://ccadl.com/files/20210901063215.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/febajojajun.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/383381985.pdfIn PDF document text
    • http://szigetkozpalinka.hu/userfiles/file/xusotelarizipupufisile.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/mazojefi.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/36004066592.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8a23eb35---jeweparenalenupotidamu.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/sokutewewofiresewobanuj.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/xopoliwasikovizonibufubuw.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/18965980850.pdfIn PDF document text
    • http://teifsepahan.com/files/file/fulenirag.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/nurebutuvop.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_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 10368 bytes
SHA-256: 72b4530f09096c070297ad6b254dfa35b295e44a5e9bb785c7f6aec714ac785f
font_01_sfnt_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 20524 bytes
SHA-256: eb93022af732791e1b5c2ca1eb0d9f4dbf164f53a5245de52f648513ce463dc7