Malicious PDF — malware analysis report

Static analysis result for SHA-256 328dd8e6d360ec40…

MALICIOUS

PDF

81.0 KB Created: 2021-04-29 03:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eedd1302f67793ce58733324b9de7277 SHA-1: e69116208743f310b455dc9ebdd544689a3329a8 SHA-256: 328dd8e6d360ec407d6ee05ca149799cb44e45b8754c76d1fed0b47e9f934b4e
186 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to potentially harmful content, possibly as part of a SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=what+is+the+meaning+and+example+of+nonfiction PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447464/normal_601075d6c927a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486566/normal_606c0548959f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_60431b1f808fc.pdfIn PDF document text
    • http://lg-copyright.com/classical_myth_8th_edition_summary0k3df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_6069e525640ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_603d39abe80ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465133/normal_5fd93b84bfed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fe7886ba5e30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461205/normal_601529f655ac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_6038fd79b0cc4.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://tawesukosipot.22web.org/23821910448.pdfIn PDF document text
    • http://xakojudanek.66ghz.com/lord_of_the_flies_meaning_beast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9259545-3fb1-41bc-93fa-ca399ab4a14c/were_going_on_a_bear_hunt_topic_plan.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_7e3a6f0beaae4b7c9501e2ed7964d2d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c462935b-e796-4ad6-ad20-6f244e5a496c/cuisinart_automatic_grind_and_brew_thermal_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e89afa-56fe-487b-92e7-df154e0d5698/why_is_my_brother_printer_not_picking_up_paper.pdfIn PDF document text
    • http://lavavil.rf.gd/galciv_3_crusade_guide.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_ccd3950e1f08447885b36f81f99276ae.pdf?index=trueIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_8e0c2b913f804f2e80c1a0af1baf11d6.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 5552 bytes
SHA-256: 05c8a9f689671fd716375043f36ee96dc4375299419129001a5eccedfe5239f1
font_01_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 15372 bytes
SHA-256: f6703250318a719d3a98e5b1e2e7bb863bb2fd63929b0487738ca09e4e6dbd19