Malicious PDF — malware analysis report

Static analysis result for SHA-256 962606fe1f4c8219…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 23:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b669f8bd13ea0b9c55c82a66e653c5a5 SHA-1: 3b6dc7f1b0d47c7d3d0cfcfb2b5d11e3d6aaf7ff SHA-256: 962606fe1f4c821979116e6b79c16f2c2c31c3f2d5602bc0b7753acadc397f4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, including one pointing to 'laborke.ru', suggesting it is part of a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=mr+bean+swimming+pool+scene PDF link annotation
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/67383393854.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/ketune.pdfIn PDF document text
    • http://domosplast.hu/files/file/7566447136.pdfIn PDF document text
    • https://kawanmto.info/contents/files/maguduvabajutixewolidap.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/62453652852.pdfIn PDF document text
    • https://ayurmitra.com/files/file/68264993658.pdfIn PDF document text
    • http://envigest.cz/upload/file/dotatijunivereluzi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161310de994798---wofolowat.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/75737705236.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/83694763117.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/ranukomuki.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/70535180276.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/12954473420.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/60921640014.pdfIn PDF document text
    • http://skia22.ru/pic/file/vakiwubadag.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/46020338576.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/316662130.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/jekawopelofujof.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/68594699744.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/13728089585.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/tetume.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/jisodelupomaro.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210910_195152.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/92349334291.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/5743918896.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_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 18168 bytes
SHA-256: b4a807626f3de9b601ce40050b89643315011ff575537fb17bd9addd6c1211b9
font_01_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 10836 bytes
SHA-256: 06d54d5a95eb407a7c4b201e1f7febfa75a0b23962a9523d129216e499c23f04
font_02_sfnt_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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