Malicious PDF — malware analysis report

Static analysis result for SHA-256 148521653f87a863…

MALICIOUS

PDF

76.1 KB Created: 2021-05-10 12:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 73920e96f89e327c029f10ad2bb0ed1a SHA-1: 452d5a63a0b23ed7ac2420abc1a3aeb6ef352454 SHA-256: 148521653f87a863ded12f3d2c8bf9e456eec6cae4fd9e4c1ad0a89f0573ad82
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with 30 distinct links found, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm heuristic strongly indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=the+heirs+20 PDF link annotation
    • http://rivugijunamusi.mygamesonline.org/lumbar_pain_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456712/normal_601250b232f72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_6012269863d24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_600ed36861b22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457592/normal_603130cba50c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_603890f979efb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_60568640b5866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_603747385e46a.pdfIn PDF document text
    • http://najelipopusivut.getenjoyment.net/44523850137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_605b36d55188c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_5fdc1bc7d6c86.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/how_to_adjust_temperature_on_george_foreman_grill.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408588/normal_60201a55b0d8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_5fd541f63282483fae198e96ab3408f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa2bb86-3b86-4b06-9040-aabe251930f7/62419642914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b1d20a-2a04-42db-b909-8ebe58b720e6/dufisixoturedaloraxagi.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_742abc73cac140f09cd20dd0ca48a9e3.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_facfbf34842f414bb8a4ad88ebd198f3.pdf?index=trueIn PDF document text
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_13f4153a39ca4feb85efe6bea32a2685.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e000294d-b73e-4815-977f-e4d578ae09e8/jexokuralusefutodoxef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29bd2a7-bfba-4b93-885a-37f18366c079/prestone_honda_power_steering_fluid_autozone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e20604-9cd3-4394-ae0f-3223652edf1d/what_is_school_wide_positive_behavior_support.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_6902cfe473424e2b92761f0cba68f0bc.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_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 4752 bytes
SHA-256: d5737399a86ce6b368b9812eaedd8d600d9015802a9e24c235acacedd6eaa008
font_01_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 10756 bytes
SHA-256: 5bff6f159d0802a2a4caf78d05b372a96cb482624d0a62cad0b9a4cceeddf771

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