Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fa74ad5c27531b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-11 22:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab62fd74e62f490ba6716d7c7769cc53 SHA-1: 9c6cb58ebc696e816ac5379ecd69581d3a68d6c6 SHA-256: f7fa74ad5c27531b3df9174adeddfae249cb039e18e5fb839f3205c744893b46
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URLs, flagged by heuristics as a link farm, strongly indicates a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection further support this, with ClamAV identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://truongthanhco.vn/webroot/img/files/87406710153.pdf In PDF document text
    • http://kientrucnhacuagio.com/upload/files/27472935764.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/kizewevatawuxoxet.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/77404248681.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/l7o9m5gdh88smbvbloso4feq53/13170170530.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/wizeva.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/96825632216.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/reveferabasanakulu.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/47740187942.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/dexodizife.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/sixijej.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/25575552374.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210908_012638.pdfIn PDF document text
    • http://ceroki.com/image/files/riguxidajubanafu.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/74973883013.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/64406686386.pdfIn PDF document text
    • https://europartner2.pl/uploads/64567311764.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613524b9dc2a1---69439340826.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/41933547770.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/fawafubajuda.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/23481248518.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/32998040352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=psp+gold+romsPDF link annotation
    • 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_off0000cfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 10148 bytes
SHA-256: 35d7d3aef29ff504fdb2ffb4e4f3d043cde5d48eeab5f027eae3564d8b258afb
font_02_sfnt_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 17828 bytes
SHA-256: f8f5c6e354b5b08bec7e1c9322175fa381da5ea49a8f7aab2bb5d6c73c4aad04

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