Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bde574b6c72bffa…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 17:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb28028120e5eb2fed21da66dd9739f6 SHA-1: a034a75035beca16ca367dd8e86027b98f3cbf64 SHA-256: 0bde574b6c72bffa0b2ec56575c3a522edbd00848eba4b57b28591ca8cd507d5
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 that redirect to other PDF files, suggesting a link farm or redirection scheme. The presence of multiple unknown URLs indicates a potential distribution network for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mmrh.myagenda.cz/pictures/editor/files/72514049214.pdf In PDF document text
    • https://eslms.com/userfiles/file/51157802655.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/dujajupuzamamivi.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/pukik.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/rutisudidixepimananem.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf88194c85---56907118973.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419839d0687---bidanenatigimek.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/52556413148.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/wokorozevelujo.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/83274838804.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/bisawusogelivox.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/27697398571.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/67327792613.pdfIn PDF document text
    • http://erpos.sk/data/files/96945801332.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/25796445722.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/juxawovefawesowu.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/25790974690.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/62004819156.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210907145230.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210913112958078.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/97858701942.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/43689759190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bus+simulator+indian+mod+apkPDF 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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 10668 bytes
SHA-256: d794386971eb1e153dca75a18c0e2697f021f633bfd3ae8fa11c87dfe3979cb7
font_01_sfnt_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 16836 bytes
SHA-256: e603bdb02069da39145393d53b835b1c09c03d419a873f5b521b4c3a6ecb8bf4

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