Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1aefb4a0ad1eadb…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 03:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c7ad9286231240b3f086dfdbf4929df SHA-1: 0f6994edd8f0b2250c67d34fdbec2556169a1e97 SHA-256: a1aefb4a0ad1eadb8b893aebda187e43fb8f46329078478002ae4377447aef2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/92517220264.pdf
    • http://architects-desk.com/uploadsfile/39198289756.pdf
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/3782983186.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/95766359330.pdf
    • http://lycee-elm.com/userfiles/file/sijafiganolawamusoruput.pdf
    • https://kermoulin.com/userfiles/file/60872029011.pdf
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/30678172328.pdf
    • http://sportingfoundation.com/uploads/file/zasoxunupatilemajab.pdf
    • http://smartvoicecom.com/userfiles/54781463268.pdf
    • https://avphunter.ro/ckfinder/userfiles/files/89559886563.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/25285738529.pdf
    • https://ww150006.linebot.net/upfile/files/20210904235908.pdf
    • http://www.annaleehuber.com/content_files/file/444434687.pdf
    • https://chennothinterios.com/uploads/file/puzalolidarodu.pdf
    • http://fteq.ru/files/file/41204849519.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe57ce1dc1---57654150141.pdf
    • https://ceccargiurgiu.ro/userfiles/file/83761135646.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b1e63cd8f---kuxasixuwika.pdf
    • https://podimercrm.com/img/files/6111539668.pdf
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/55991823872.pdf
    • https://blugarden.eu/file/fuzujeretupupamemesiduv.pdf
    • http://studiogallerani.it/userfiles/files/zavumizidemobigalijiteki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=coco+free+online+movie
    • https://www.thc.gda.pl/ckfinder/userfiles/files/visemulejozi.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_off0000d91c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 16792 bytes
font_01_sfnt_off0000f133.bin
f641b6ce8bf1e86095e5dc6cbbb86e162bc4157feabb7e1917ade2040f3b1b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 10164 bytes
font_02_sfnt_off000107dc.bin
435926d9e5b7979fcec240fe7506ba40b3415328ae4d58ad5874833f2bf07cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 17424 bytes

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