Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf29bdda2efec9a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 06:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e3fe5d24dba4acbe9bbfb934c4afb63 SHA-1: 72a908efcbab4ac7ba6c2fe04c648cfec8f16aad SHA-256: 8cf29bdda2efec9a597e1d04aef0e89dc6d54d9a91414ec996ae17c5ec89cef0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=ocean+of+games+android+gta+5 PDF link annotation
    • http://maulich.vn/attachment/files/97493245504.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/poxekumagevipaxulik.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/jufema.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/27802400015.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/72961081433.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/widon.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/67611435599.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/63520331492.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/80560312615.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/36596029058.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/gefudamakubunul.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/25908351076.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/legijewomike.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/linanalusevusowanasebub.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/m06oplfueods03sivjmi5gjogt/rivasimabubejex.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/43088228217.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/97300361772.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/fujununodegide.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/11056788496.pdfIn PDF document text
    • http://yejida.com/userfiles/file/wanopug.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/24556084021.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/55875876677.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/vilinusidipofu.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_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 18908 bytes
SHA-256: 9096a99ee95318acbcf2dbb7927421e8f23df4f1e914190e915337a430db3e17
font_01_sfnt_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 10932 bytes
SHA-256: 663e73b9acb6e60a08ec2daa3e0d8b7349388d18cedf80077d134f8fe7d9e657