Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec314bee6750d6e1…

MALICIOUS

PDF

77.9 KB Created: 2021-09-23 03:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b95c8c064c84f798c99da57e0c6111c SHA-1: 0d50f066ccff9f13e54918b928f7225032167136 SHA-256: ec314bee6750d6e1ed4821f51580111a8ff5bfbcd82d9ccb742db290344e9dea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to obscure the final destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's intended to redirect users to malicious websites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=cricket+games+not+on+play+store PDF link annotation
    • http://panova-art.com/files/file/39825802266.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/nenajoxijavolawewov.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/32605676501.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/52279275410.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/95251802495.pdfIn PDF document text
    • https://paradigma.bg/uf/file/6720367290.pdfIn PDF document text
    • http://pasted-radio.de/web/files/27136360950.pdfIn PDF document text
    • http://aromata.ru/upload/files/86681833512.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/13710739423.pdfIn PDF document text
    • http://art-ball.net/files/file/bakojekomele.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/eb812aa08d288891cbcf8d8941ed97a3/66745631154.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/70406903490.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/mibupujur.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/melopawut.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/30398459603.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/tegamixigusol.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/guxenepawepital.pdfIn PDF document text
    • http://rhondachem.com/d/files/57043837902.pdfIn PDF document text
    • http://kodemari.info/data/files/99759242035.pdfIn PDF document text
    • http://balone.net/_upload/file///zanevedunirubates.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3d27a200---60966578907.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/96469204580.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/39665390842.pdfIn PDF document text
    • http://stonebreaker.at/tigapimilirudewemikezexi.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_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 10956 bytes
SHA-256: c6f229deed1d207546eecdbbc65a98d7bb853abd481b494d112c4f1184d1cbc0
font_02_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 16784 bytes
SHA-256: 59404388f0dafbfc9526ac43ddac5f36400f7115df36cd61523b39ee1ea62e53

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