Malicious PDF — malware analysis report

Static analysis result for SHA-256 922a15053a976a65…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 09:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97f087045d7812c6b29117b0826a96ee SHA-1: 3570c81765c15580276a60b70b1009a435fbf7bd SHA-256: 922a15053a976a654daf37a8d24c7cb354066a7a0c7032f65bbce87c30e4ae72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of external URIs and the ML classification strongly indicate malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=a+gift+to+remember+123movies
    • https://thietkewebseo.com/webroot/img/files/ripufavedamevidowojaro.pdf
    • https://aprilboya.com/userfiles/file/21393328145.pdf
    • http://hndgyl.com/v15/Upload/file/2021927559553556.pdf
    • http://langeline.com/ckeditor/upload/files/8779864184.pdf
    • https://timavoshipsupply.it/userfiles/file/xejas.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed736d4664---botig.pdf
    • http://pm-ural.com/uploads/files/faruwesuvazewufawumodinuv.pdf
    • https://www.oalysa.cz/ckfinder/userfiles/files/fufiborejeneli.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3231aeda1---bevovagabimiw.pdf
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/welujivisakorivob.pdf
    • http://ksnjl.com/userfiles/files/77279066048.pdf
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/97092203823.pdf
    • http://biaikatolikus.hu/files/file/57029432705.pdf
    • http://aesg2edcv.handylover.com/upload/files/45927335164.pdf
    • https://rajatotogroup3.com/contents/files/mamenivatalazenanokowati.pdf
    • http://namngonviet.vn/user-/files/6111963771.pdf
    • https://mimpidia2.com/contents/files/73088101438.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/2912099000.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/difilovobitilav.pdf
    • http://zensushialiso.com/uploads/files/69224041718.pdf
    • https://scout-educationguide.com/userfiles/file/18029565150.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_off0000ab8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB8B 16792 bytes
font_01_sfnt_off0000c39d.bin
e848df7fcb18fc4b12d89a24c2422b0d3530cc44822ec3298480ecee87067834
pdf-font-stream PDF embedded font (sfnt) at offset 0xC39D 15720 bytes
font_02_sfnt_off0000ebeb.bin
22448abf6c7a216131b229939286c6d17725b285dafae2ef2246174d620ca94f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 10776 bytes