Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e4bc6aa5ac489d…

MALICIOUS

PDF

75.9 KB Created: 2021-09-20 13:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a3cda28775b066d1e5c86c781d57028 SHA-1: a52190576971d0c642c496f6f0ec39fed7a8c282 SHA-256: 84e4bc6aa5ac489d9327b880cdd73f049751ca68dd9a2c015c5ffc75b8f4d5dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, indicating a likely phishing or malware distribution scheme. The PDF structure and embedded URLs suggest it's intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=present+perfect+simple+and+continuous+exercises+with+answers+pdf
    • http://barrospizzadb.com/uploads/files/jobugeturexowibilob.pdf
    • http://nature-revive.org/files/file/lafusomakazex.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kogukurifilovedaperazala.pdf
    • https://reniuved.it/file/kuxomorazigudatogipegep.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/marixokosufawixotesi.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc4c292308---85222411943.pdf
    • http://neurooperations.com/ckfinder/userfiles/files/68888118557.pdf
    • http://mentaplywood.com/images_upload/files/kapututogokejaxowebugux.pdf
    • http://monarchiaerembolt.hu/tmp/zeteniborubizuxavotovo.pdf
    • http://rtm-plus.ru/ckfinder/userfiles/files/36002967173.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/15807517025.pdf
    • https://olboihorgaszto.hu/editor_up2/palimorozuzapomolisinig.pdf
    • http://polesprogettazioni.com/userfiles/files/81377617417.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/pitapegofabafazaxabudiwuw.pdf
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/87656335717.pdf
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/peniradufof.pdf
    • http://obchodsezlatem.cz/upload/files/45162374086.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/42154152020.pdf
    • http://alpinedelhi.com/userfiles/files/mivag.pdf
    • https://croatia-flyfishing.com/files/dibotaleberebatuxuxek.pdf
    • http://kaies.cn/upfiles/210915212036647865yvtnnt.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/25727680241.pdf
    • http://naturalwonders.com/uploads/files/tituzadegoriximot.pdf
    • 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_off0000c385.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC385 16792 bytes
font_01_sfnt_off0000db97.bin
a696e902376ead149d8cad864bd3f6eaee1d7822a90cbd3730334f9eae5077c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 16904 bytes
font_02_sfnt_off000106fd.bin
e750e195818f8340fb4e20c38f4764a201ae61060ca7e46b39f157966a824abe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 11172 bytes

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