Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3c2ab11e82762a…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 18:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 208101f1abbc90cdea46a8e7fcb38d6f SHA-1: ebe2638f5f4951ff4e6128aeea1a2552230418eb SHA-256: ba3c2ab11e82762a613055067b3d7677f90206a4e49c914a0d97332cf4a499dd
166 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. While no scripts were directly extracted, the PDF structure and external links suggest a social engineering attempt to lead the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://onthespothousing.com/userfiles/file/15501902430.pdf
    • https://terminarz.online/kosmetyczka/krakow/files/remofijukikuzinizupav.pdf
    • https://samsunyapi.com/userfiles/files/11554078737.pdf
    • https://etevent.itweald.com/uploads/files/61446915baf28.pdf
    • https://livewireeventz.com/userfiles/file/66650181698.pdf
    • https://taksis.lv/taksis/userfiles/file/37241025904.pdf
    • http://solmoda.it/userfiles/files/vibajugedimutaw.pdf
    • http://diegogenna.it/userfiles/files/xixuwamelowinifopapulemor.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/zodarogutimafozakajubazeg.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/68962938642.pdf
    • https://ddtoyz.com/ckfinder/userfiles/files/36386596174.pdf
    • https://avistravel.ro/userfiles/file/51307484388.pdf
    • http://www.specemc.ru/upload/files/xenil.pdf
    • https://yifff.se/userfiles/file/wopebekinivawadaragofem.pdf
    • http://cybernet.asia/UserFiles/File/foxivumotexirenipibaga.pdf
    • http://basaritarim.net/admin/editor_resim/file/9158488517.pdf
    • http://www.tivafa.hu/upload/file/fijisavotuweniw.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/wevopudajoluvuzudaled.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce88249df---fezavepadodunaleva.pdf
    • https://tcremich.lu/files/files/20437553066.pdf
    • http://soleilboo.com/images/uploads/files/23075913649.pdf
    • http://elrey-uslugi.ru/media/file/38333885831.pdf
    • http://worldnaturalfood.com/image/upload/File/zimokuralelivotel.pdf
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/50079916436.pdf
    • http://fecirturizm.com/resimler/files/xukujibibokoperudomaf.pdf
    • https://budgetparking.ca/admin/uploads/file/kulosi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+farsi+keyboard
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de72.bin
ffdf7670a324e917966bc659742d524524fbc1274c197720329043739b0c3c35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 10528 bytes
font_01_sfnt_off0000f692.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF692 16792 bytes
font_02_sfnt_off00010ea4.bin
bfd6df83e4c52cc7143470b3c24c3408e2c9cbd98a7bd735e754d6775585e1ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 22496 bytes

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