Malicious PDF — malware analysis report

Static analysis result for SHA-256 4573d2a88765f46e…

MALICIOUS

PDF

68.5 KB Created: 2021-03-13 15:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6889974f941962b4270557b85e124727 SHA-1: ab1e87fd040a82482d966eae971441914a134563 SHA-256: 4573d2a88765f46eded09cc2934afba1743cad4110a0b57bac2cb391ab637c72
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://kuzutuzo.ru/strik?utm_term=eheim+auto+feeder+manual PDF link annotation
    • http://matizaw.mywebcommunity.org/76216475610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469355/normal_5fd714deabda7.pdfIn PDF document text
    • http://pobunav.sportsontheweb.net/loloxot.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/calendario_anual_2020_argentina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392869/normal_5fec023b784ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_6013084a0d406.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/4318d1.pdfIn PDF document text
    • https://zopivorideruv.weebly.com/uploads/1/3/3/9/133997575/f514ae66fa7f.pdfIn PDF document text
    • http://dle-tpl.site/97431708769vrmdt.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/balancing_chemical_equations_practice_class_8.pdfIn PDF document text
    • http://mabay.fun/the_lion_the_witch_and_the_wardrobe_summary_chapter_8ub8u9.pdfIn PDF document text
    • https://bowetupivivuz.weebly.com/uploads/1/3/1/4/131437724/kogadilur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_0d5dee39e54f4f36b82ecb0e65c7be76.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_2a450cee2c6345da9c3f28092f6b20d1.pdf?index=trueIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/kenmore_elite_he5_electric_dryer_belt_replacement.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_df6fc2bc7c4c4f0fba604c75120f0753.pdf?index=trueIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_06220930289f49199f40d27b4dcfaec0.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_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 4924 bytes
SHA-256: 13783c2903d2c94b3eec70c4d70b19549982be8af388f1f409a4959b1e469117
font_01_sfnt_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 11192 bytes
SHA-256: b085a84720a7861576ce4f653afb3304ecbd7c7cccf32a3c5b986338764cb02f

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