Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0064e6b41786b2…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 23:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c34fce94f06bf6bb8ada051716e6bd6e SHA-1: 1eb393fa20327c7aa1c06caf5ae0857840909ee5 SHA-256: 9c0064e6b41786b29cc7f8622abc9fa73dad4351b24f1fa9b38b8642625ba0f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting a tactic to distribute further malicious content or phishing pages. The PDF structure and embedded links are consistent with attempts to trick users into downloading malware or visiting malicious sites.

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://garglob.ru/uplcv?utm_term=principles+of+physics+5th+edition+solution+pdf PDF link annotation
    • https://weekendtripskolkata.com/userfiles/file/rawidimizisiwaxibipaga.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/20/95694934559.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/23422133945.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4b19972bdcf8770f59b9c8ac0eb7220f/bazekorofu.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/sopikelagoxozimokajog.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/mevofedelatufasimonutesam.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/36992622441.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/m7ja0jjpsoov6g47nndumq71t4/72355035139.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/15033150678.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/62205638125.pdfIn PDF document text
    • http://onlinevay.com/upload/files/66935634197.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/98908766723.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/1939511383.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/8323585751.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/fireluverixezukuxikunoju.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///12681289648.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/47056895609.pdfIn PDF document text
    • https://forumsevens.com/images/file/roponatuxadumesexosijalo.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/9081120547.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/18850593115.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/55167426180.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/nasaxa.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/38625675266.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/jizakupewizi.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_off0000b3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF8 10904 bytes
SHA-256: b8850c9777674170f441b34b92660b4dc935905db2bea32129163c98ec29b01f
font_02_sfnt_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 17012 bytes
SHA-256: ff5c1692c0980b6676bc5e9ebbde1591e8afe00dd06ca7aeb4bf0d665c0f0fbc