Malicious PDF — malware analysis report

Static analysis result for SHA-256 966582520e89bffc…

MALICIOUS

PDF

86.0 KB Created: 2021-10-04 20:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b77a96995b75a644d887c5c50f5dab05 SHA-1: da1332c684517dc4c4a373e10427134cd74ef572 SHA-256: 966582520e89bffc38043b92ea5b6c290da36545cf795e57a95b9a2c5fee98f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://facades-et-traditions.com/actualites/file/mulawumixuwiwitasuzedolik.pdf In PDF document text
    • http://champaigncursillo.com/userfiles/file/vapabevizisobemegu.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/pibewuvapodozim.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/bolanagovunanere.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/68609840933.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/1929411005.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/kuvirekuzanupoxopemu.pdfIn PDF document text
    • https://krusomying.com/data/file/17182294766.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/jazutotikak.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479a01adbd6---ragunujevemoka.pdfIn PDF document text
    • https://invision.buzyhub.com/files/50110927742.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/gomaxevudilunelexanipama.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/gifobimagisemi.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/28056689698.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/75910555135.pdfIn PDF document text
    • http://mlead.net/images/e/file/nizako.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/gaxafew.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/85257331067.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/59719987036.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/17609453598.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/nepetexumovatavegeg.pdfIn PDF document text
    • https://dm288.rs/slicice/file/vinuxara.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/66173885005.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8f213ed3b---57318415503.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/48160131839.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/13226512172.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/15815623068.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/52605397360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=discovery+2+user+manualPDF 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_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 10692 bytes
SHA-256: 2465cf1e1d2baac1614dd0d0ea9e011f3e5ca3a165c586bb43c381a409725b8a
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 18468 bytes
SHA-256: bffe94972664e0d2630db7bb6bf7bd00605fa27747e300acadae538b4a63e577