Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe4511f0eaf1248…

MALICIOUS

PDF

78.6 KB Created: 2021-02-27 17:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fa597be58ed0195448bfc97e9a84bfd2 SHA-1: a494c226abc99f1e758bb823f5d18a1d73568828 SHA-256: fbe4511f0eaf1248327ae9a6842594f6aa963cdd8e12f7d32073b02a56e122d3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'vilenefex.ru/award?keyword=how+many+types+of+contract+in+law', suggesting a lure to a malicious site. Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, likely phishing or a trojan. The document body, though heavily obfuscated, contains text related to contract law, aligning with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=how+many+types+of+contract+in+law PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479224/normal_5ffd49262eb39.pdfIn PDF document text
    • http://idealica-italiauficiale.website/26698341780o7vj8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_5fd8b906213a9.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/guest_services_supervisor_job_description.pdfIn PDF document text
    • https://wipemaxo.weebly.com/uploads/1/3/5/3/135345075/moxasezudodiruk-xedemuvapali-xegabososire.pdfIn PDF document text
    • http://lowazaz.22web.org/abaddon_dotabuff_guide.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/beats_solo_2_wireless_change_battery.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_6014a50d480dc.pdfIn PDF document text
    • http://pumba-timon.space/zadosigelobafigunixidekotr3je.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/zevusawaluremox.pdfIn PDF document text
    • http://osummer.space/9069449713641ynh.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/debut_xedixiguduroz.pdfIn PDF document text
    • http://hotita.space/royal_oak_archersys2or.pdfIn PDF document text
    • https://vixekilawuta.weebly.com/uploads/1/3/4/3/134305586/911891.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://boxitevu.rf.gd/owners_manual_toyota_corolla_2017.pdfIn PDF document text
    • http://ketaxijos.rf.gd/how_did_rafael_nadal_became_famous.pdfIn PDF document text
    • http://xakosafejel.epizy.com/jupowu.pdfIn PDF document text
    • http://gikasabedadex.rf.gd/kuxuni.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/bujabubodiduripipuvi.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 5104 bytes
SHA-256: 95a61c11b7c9237fe767aa906b6b58a9aa8ab41a1080b77edf98f43f7a4d4d5a
font_01_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 10668 bytes
SHA-256: 9789c899e342672b794aad9803421a7c2fed7a922ac332db2d771f94917dcf3c
font_02_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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