Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cbf529b720a324…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 00:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff1fb58b3601c22a66fd68dd9eb1c9eb SHA-1: 79adc1d83a20a5221c50641dd3214ecb38fffbed SHA-256: 89cbf529b720a32495b4f12489eee14e02a6338d908d50392034d246d979a754
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external sites, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=counter+attack+multiplayer+mod+apk PDF link annotation
    • https://skyzoan.com/cake/beta/userfiles/file/zirojikivufulifazebapare.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/9138409012.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/31782876670.pdfIn PDF document text
    • http://yepuco.com/uploads/files/gitukeweluwunadis.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/khlbcg0gvhnla5a32kl7vqfold/85888564308.pdfIn PDF document text
    • https://campermagazine.tv/public/file/folelozaf.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/22130963744.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/wasewafugivekizisa.pdfIn PDF document text
    • http://domuran.pl/files/file/zupuv.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/lokufunuwevudujimaz.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/76322626268.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/nezoxasubug.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/vezugetunarutopo.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/35761831471.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/25882363215.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/76666753065.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/nomomanozosuludiz.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/29409334674.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/70851774753.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sivobupeturobajarini.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/xububuni.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/suvezuz.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/24437281158.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/73250429193.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/23552873837.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_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 10844 bytes
SHA-256: 5a51fdef4359e2517a349ae5bb86535a70a02b0889b11a551f221b1dcf094a53
font_02_sfnt_off000109b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 20648 bytes
SHA-256: 71ef3e3db03fa3f828d0ef05dbf812adc4aa2a5ffb6324fcc834ca53601cd30e