Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4ba6546fbb3ce8…

MALICIOUS

PDF

84.8 KB Created: 2021-09-20 04:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d461c6f8c11829f25de8deebf9338a2 SHA-1: 31fb7c7e9fa330731f6dbfec5f61f4ac80e7069f SHA-256: 8c4ba6546fbb3ce82ec6ce6a05df222ab2ec780c5932bbcd967b1fbf91bf7e24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to harmful sites.

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://philabc.ru/uplcv?utm_term=multiplayer+soccer+games
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/datowuwuxitetasufagaso.pdf
    • http://azbuka-d.ru/ckfinder/userfiles/files/45129024655.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/12291291418.pdf
    • http://www.kowel.com/ckfinder/userfiles/files/1631192622.pdf
    • https://bostaninsaat.com/image/files/72891833125.pdf
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/fufizaxesikabupokowus.pdf
    • http://nhatrangpalace.vn/app/webroot/upload/files/45471955163.pdf
    • https://ermolino.mebel18.com/uploads/files/74977670763.pdf
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/29636147845.pdf
    • http://naphogacomposite.com/upload/files/12663754526.pdf
    • https://canionglobal.com/FCKeditor/file/nisewiwikolinabibaxivet.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e2fcf7187aa54ad64ddc031114ead1a8/sanano.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/kumudalibutamunewimijot.pdf
    • http://entrackintl.com/uploads/zixulutugizigu.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c544d7b2a0---nakuj.pdf
    • https://chrmglobal.com/userfiles/file/71151512422.pdf
    • http://evopizza.lt/ckfinder/userfiles/files/raguxawubefiroviw.pdf
    • http://first-group.kr/ckupload/files/52149537030.pdf
    • https://jin-hung.com/userfiles/file/30223199455.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/31769411873.pdf
    • http://baltyk.recykling-rejs.pl/imgturysta/files/68169125430.pdf
    • http://perfecturology.cafe24.com/upload/editor/imagefile/21458974032.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_off0000e7dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 16792 bytes
font_01_sfnt_off0000ffef.bin
65c22f786053285cb83f855fdcc7c3445ad070fc424f5d8226291cbcbbc1cf15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 17384 bytes
font_02_sfnt_off00012cae.bin
23f52207c2082db5dd86c8230e0a7bba91e83ca5f325c24799f30f2a46f1e959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAE 10820 bytes

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