Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b6ad4e4231918b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-24 00:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea66d1d87f8cfe6c1ab058b36659a15a SHA-1: be2999b0e5cfb46d39997fd502207a9d45cc4d3c SHA-256: 60b6ad4e4231918b436a9d00766349c4d90bbe5606d331ae83e2d084a7be6101
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://garglob.ru/uplcv?utm_term=sm64+green+stars+download PDF link annotation
    • https://atkarisuli.hu/userfiles/file/9801357602.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/narijezukusagizo.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/19720772497.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/63844451956.pdfIn PDF document text
    • https://nasikampung.info/contents/files/tuwigitirodefipabixagar.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/53277980836.pdfIn PDF document text
    • http://innotack.com/userfiles/files/xutomilekikugewilavawi.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/bukixa.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/40655171338.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/vowaneve.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/xufevituweripipum.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418bf96afe5---vesud.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/69929923297.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/78677788822.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/65438460288.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/21926366843.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/gukugitudarifisifu.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/23531192780.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/lematop.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/zopopowapibunu.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/52726186477.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/daxiteliwisuviditodurobo.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_off0000c14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14C 10904 bytes
SHA-256: 44869f3cfb70e6d5b33674e4fe34c180b2a15c9e05d7ba83aceac27e441fa87a
font_01_sfnt_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 17932 bytes
SHA-256: 0879927ee7770e156c7e1ab186d95456c683b3ae996c9a2bede1297d5d386fc9
font_02_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1