Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87fb589afb703b4…

MALICIOUS

PDF

78.4 KB Created: 2021-09-23 08:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e4e35855eeb5a750df7a36a35bef568 SHA-1: 66e6d5e655a0d1050bceb0d6bada0899febddeb3 SHA-256: e87fb589afb703b47f49b0a3a34e3db64c1e4e3d041b0cf1619499ed00db18e7
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to external, potentially malicious websites, and is described as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=terra+monster+3+mod+apk PDF link annotation
    • http://bezpiecznamlodosc.org/files/file/98999066129.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/fekemi.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/42461243255.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/legatipu.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/jagelotozalumado.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/sitowupuwibavigedupefegi.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/femibidoxorewipa.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/zepulosaliweb.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/vodizunevojemevebunud.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/zadoroz.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/19587392768.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/7118032059.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/806629b6b626da2b625bc84a1996e162/lugusotikobolekugovazo.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/nuwopulufitopomom.pdfIn PDF document text
    • http://ping-property.com/user_img/files/sasalarasadug.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/mitazunurok.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/99037934558.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/vezagaremojawadoxamivugox.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/limenijobimakin.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/41646835209.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/jbrnhus9lt3co38a995aq50qma/30371413169.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/kolus.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/sajafusanimup.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/gugiwapurakitunaso.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_off0000c854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC854 19572 bytes
SHA-256: e49f8377f784d82c7f425df3fb92a205f9ee75edcdba57a6d4ebe8e3e6ece13e
font_01_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CF 10640 bytes
SHA-256: 14093abba2d713baf72b458b0b36e227c08a795db7391e8a17f180ab90e337fd

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