Malicious PDF — malware analysis report

Static analysis result for SHA-256 da348783de398e32…

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 13:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c15d31218abf2ab08d05e3995f1afaf SHA-1: b275cf86aa2c48696978146812dd6e28c1459d80 SHA-256: da348783de398e3230ed174b9876307fb4596bb16660645d3dddb8202210cd56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://avukat.dnsaktif.net/upload/files/sokekaborekekeza.pdf
    • http://www.ciesol.es/ckfinder/userfiles/files/14222448492.pdf
    • http://alarm.pl/userfiles/file/gipijakuwijuwonowilefad.pdf
    • https://goodline.by/userfiles/file/43308871446.pdf
    • https://villamishkan.com/310renonew/front/images/files/65406205352.pdf
    • https://plewmal-d.com/Uploads/files/42268370691.pdf
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/4064342375.pdf
    • https://curvy.tw/upload/files/35457976357.pdf
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/57481365844.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6c299407751ad77479d561dcadd6286d/4467809253.pdf
    • https://girisimhaber.com/uploads/file/29339941647.pdf
    • http://nwatchonline.org/userfiles/file/87192120611.pdf
    • https://baigiangtoanhoc.com/upload/files/konojinojokew.pdf
    • https://xo-sound.ru/userfiles/file/34688000913.pdf
    • http://auto-rad.pl/userfiles/file/81406782628.pdf
    • http://webinaris.blog/ckfinder/userfiles/publics/files/7526422811.pdf
    • https://armagedonspedycja.pl/files/file/robobebu.pdf
    • http://studio-rivetti.it/userfiles/files/sujefewelofomixudulur.pdf
    • http://bridgeonlaw.com/filespath/files/20210905180327.pdf
    • http://cmtsport.com/pliki/70558335196.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138157454948---gavefozawas.pdf
    • http://justsayhi365.com/uploads/file/21062103779.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=words+with+x+at+the+beginning
    • 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_off0000bc67.bin
8197ccbe3f887f16bcefe3ef82838467ee83e737cd000579120c70410d80985e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC67 17896 bytes
font_01_sfnt_off0000eaa0.bin
533fcfd4362c8a5478ead9dd84540d3a384ede6b9549f82a75ad6588a3918450
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 10800 bytes
font_02_sfnt_off00010352.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 16792 bytes