Malicious PDF — malware analysis report

Static analysis result for SHA-256 9842468fd5366c5c…

MALICIOUS

PDF

80.6 KB Created: 2021-10-04 12:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 85875f7452988e62d1d05c7506b8dd36 SHA-1: b6a1830bfa88041accd5956afedf994876aa334b SHA-256: 9842468fd5366c5cd62a320f917adda26a095ca8606cfc24ae90b78574cadf99
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=i+forgot+the+answer+to+my+security+questions PDF link annotation
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/96915385152.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/vijujimevosadinuxurujodo.pdfIn PDF document text
    • http://clingac.es/d/files/jufigidevubetanimi.pdfIn PDF document text
    • https://kimcert.org/E/file/13872636791.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/85174879031.pdfIn PDF document text
    • http://hainfelderteich.at/gonakigaxebabibunove.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/98417641273.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/65054945171.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/liropasekelanetikibe.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/82330647903.pdfIn PDF document text
    • https://majubesar.com/contents/files/85771950643.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/judoluxobowutu.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/rixafijifusi.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/37653378682.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/takikagefabatagesezijoxi.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d6eb89fc18cbefb24ea45a5ce80116fb/xopojabekuvul.pdfIn PDF document text
    • http://tcihk.com/userfiles/30284778781.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/33109246531.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/ganixeneribilokotenun.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/lenob.pdfIn PDF document text
    • https://niceppl.com/images/file/kijuj.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/oj5j3glaervc2uln222leka3g5/98071060062.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/88083367996.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/62586903471.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_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 18456 bytes
SHA-256: a435194c29e2bcd01195079bb32b026e9aa6377d181f22cd54b7c0d5ffca729e
font_01_sfnt_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 11136 bytes
SHA-256: 2ac52476328ac4bf22a022f119163c40049c4adb1aaffb86232811e18bdcedff

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