Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6864905b954e73a…

MALICIOUS

PDF

88.4 KB Created: 2021-09-22 21:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3bcaee4d315d3c5f865069138dc9c1b SHA-1: d4f26dacf9738dc0af166d2afc9a76666296fa06 SHA-256: d6864905b954e73af1de129e82983eaf097b60186196494062cb3d8883406a00
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one pointing to a link farm, suggests a phishing or malware distribution scheme. The heuristic indicating an instruction to disable security software is a critical finding, directly supporting a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=the+sims+4+free+dlc PDF link annotation
    • http://lycee-elm.org/userfiles/file/petesujerovozofetit.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3bn70d2cqt5c4093s66jgsmceo/gabasotuzaxolejeruxuse.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/jadexafajewevuloturepegaw.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/51473490.pdfIn PDF document text
    • https://beautydent.hu/editor_up/tixakewetofifazosar.pdfIn PDF document text
    • http://esistore.be/userfiles/file/99395722817.pdfIn PDF document text
    • http://18554080.com/userfiles/file/lajekajememagin.pdfIn PDF document text
    • http://iviltra.lt/images/files/gisanov.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/fisegajuji.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/lawovosutojusagetopuxa.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/misikeromeritoru.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/11318894812.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/91793548008.pdfIn PDF document text
    • https://longhoang.vn/upload/files/34784223146.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/tonepegefem.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/4957505591.pdfIn PDF document text
    • https://latework.cz/soubory/nufaxisutasiliwojite.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/purakibiv.pdfIn PDF document text
    • http://finchamauto.com/pics/69408820034.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/66458344202.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/gapepuwemitawixusi.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/fabesinedapojurivukagi.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_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 19016 bytes
SHA-256: e641c501f57467a3149bca8399239331f31b4c492eb12dacf278ca48d67f621a
font_01_sfnt_off0001250e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 10300 bytes
SHA-256: 896ca3c8a002c050f3470065fa5a8fe3e8d976556b2d7f8e5569a8dacc0d33fc
font_02_sfnt_off00013c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1