Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae21f6ab7c7baf81…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 08:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0affcebc0a0329a117c530fd1744d2e5 SHA-1: 07294bf9dfc72d8bdedf75fe769055d39d4ce59b SHA-256: ae21f6ab7c7baf8169041bcea2a6c6be035392c8ea3c67bdd061165a9c763de7
166 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social engineering tactic to trick users into installing malicious software by posing as a necessary browser update or extension. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://kalitelivideoizle.com/resimler/files/kiwasunoxijisulufovaxeku.pdf In PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/37790547555.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/41939184439.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/13876851408.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/lemekozujepusolipixokadev.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/barazovesel.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/25831500163.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/xodijikojo.pdfIn PDF document text
    • http://ecole.ru/text/images/file/45598579475.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109031315083998.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/zezizinikevosipejifexola.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35001741e---75864382330.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/xovitolomufukujin.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/vuwujabozedezulijowo.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/rotegazibufabonavak.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/wuzapufuge.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/89742575705.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/bosakinefagujovazegilit.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/65965494605.pdfIn PDF document text
    • http://zenkatsu.dk/files/wuzomenebipatuwoni.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a63401bb9ff29697878a8e524a7bfd6c/mudekoxabosunivovufemimal.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/13218325495.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/siworirejomejo.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/27377905870.pdfIn PDF document text
    • http://teknis.it/userfiles/files/segejovogitan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=screen+grabs+for+androidPDF 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_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 18820 bytes
SHA-256: 764652e4516f3b75bad73c631dae129f52c84407fbd0a34467692d09222d194c
font_01_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 10720 bytes
SHA-256: 229fc7c3e08723c03c1c77192e4ec196682498c3a643c1fa2c0f020893cdbf21
font_02_sfnt_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1