Malicious PDF — malware analysis report

Static analysis result for SHA-256 d742bb84961dfe0f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 08:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a09e7fcb1d7eaa7b1072a71eca106e5a SHA-1: 2d6241359885b463a5b1829eba1c06c39d133911 SHA-256: d742bb84961dfe0feae746d86b90d9e03b6acef658d1675ec88b7193b8aa180b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded links pointing to various domains, suggesting a phishing or link-farming scheme. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=screen+mirroring+iphone+to+android+tv PDF link annotation
    • http://bike-aholic.com/UserFiles/file/konuvebovaxajisul.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/dubofavezilonugodogin.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/fesotikofafelej.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/jibiwuxapatij.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/46269203565.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/tefinititivilamapujasu.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/buwugena.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/xeturezuzajivepuralevin.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/27762973415.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/32065576097.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091209205633293.pdfIn PDF document text
    • https://patc.fr/imagesfile/78829505708.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/97984304241.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/balemuxaxibopa.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/66166552388.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/tafalajapawoniloz.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/tovoduwekaka.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/suwejabepizuzo.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/diwevojejimata.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/79859498193.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbae1927f2---93352868095.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/27064656997.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7c55b620b4978a4da613cc23716be736/97669986672.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/06/39016804426.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_off0000ccb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 10888 bytes
SHA-256: 22b8250130f0dd40dc94bd7b8e16976d0531aa6e7b320bfecf90c06d11d21ee0
font_02_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 20324 bytes
SHA-256: 32cf6349a60d02553db41549a001a5dcff4d83cc5848a54958a2b20d7457f12e