Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d5a8088c84587d…

MALICIOUS

PDF

78.4 KB Created: 2021-09-14 21:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9d33cfd4425bea0e0c01f0117d0f1779 SHA-1: f0fc85739c491f5c78593e93d8036b15de2beff7 SHA-256: 13d5a8088c84587d863e7a3b8263b9cb83bde521398eb316764c7e1c2326e2ab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing infrastructure. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=autocad+on+android PDF link annotation
    • https://kaptenhoki.org/contents/files/85678814164.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/13848285048.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/47829133211.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/86864724160.pdfIn PDF document text
    • http://net-work.cz/data/file/xiwatafidowutokidideras.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/40411287568.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/pilopalutivi.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/38369424069.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/82002792746.pdfIn PDF document text
    • https://edex.co/userfiles/files/64362367578.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/28879431569.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613167a5c667b---dinegepabomeluzivev.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8618ad84a---jatugovapibizisonewu.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/29433026439.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/zugibewisut.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/33514848134.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/11262156110.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/27550448011.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/90011042361.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/fepis.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/65387998433.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_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 19740 bytes
SHA-256: f7a5de98b3adb2f2ad27e4c17199b15d6d171fb051dbb2edad5e07b7718a3af0
font_02_sfnt_off00011621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11621 10100 bytes
SHA-256: 3cfcd8b182356c0c33e7f271c8eb467d8fec7ecf47047675c1154f5e40e9c51f

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