Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13bdc8feb308ebe…

MALICIOUS

PDF

67.3 KB Created: 2021-09-28 12:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 347ac980f23aa5a6e8bec96793dfc3c0 SHA-1: 1a780b530ea53c17c7094e60b7bd83a6be050d26 SHA-256: e13bdc8feb308ebe8ac193483c11f1618f4641edb7c55ac43c92a929b4aa39b1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to external sites, suggesting an attempt to redirect the user to a malicious destination. The document's structure and content indicate it is designed to trick the user into clicking these links, likely to download further payloads or lead to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=best+coop+games+on+phone PDF link annotation
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/talefoduvosexegaru.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/kojob.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/wizalupezeruradudodaxene.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/gujorebe.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/puviziz.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/17689280998.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/nudoja.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/repifawizuwazekebemomuxed.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/divawuw.pdfIn PDF document text
    • https://rayvoltbike.tw/geektic/files/kafepudoregogobudubuxan.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/zupoputorumemegav.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/13622290476.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/66476027947.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/tesesu.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/gonidijol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8fd9d9961---62270059060.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/tagaretiriketa.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f20e0ce87f---65562689698.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/84454853504.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/mojixim.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/15077787656.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_off0000ac4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4B 10636 bytes
SHA-256: 867e877cfd3045426ffdb3e21580553387cfaee230550758deb50b4353b07e24
font_01_sfnt_off0000c482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC482 14196 bytes
SHA-256: a4abbf14ce07dc58b7a4a79b2555a5760ec074f2be1101b691451a7335e070e9
font_02_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1