Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba33572d8f738f4…

MALICIOUS

PDF

81.7 KB Created: 2021-04-25 05:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9309b0f8ce118a640b2047cfbc03e75e SHA-1: be7352e08a63a435999f49eeb54e22c79aaa92ab SHA-256: fba33572d8f738f48264aff315e69f92e03a9345f84d3019437a3120bb62b190
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the primary goal is 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://zajinet.ru/strik?utm_term=computer+systems+engineer+education+requirements PDF link annotation
    • http://kevakigev.medianewsonline.com/bye_laws_of_cooperative_housing_society_in_marathi.pdfIn PDF document text
    • https://fodubimofo.weebly.com/uploads/1/3/4/8/134884763/bezapewam.pdfIn PDF document text
    • https://xabomitutopimo.weebly.com/uploads/1/3/5/9/135961599/vedamem.pdfIn PDF document text
    • https://zupabigawobal.weebly.com/uploads/1/3/4/3/134326688/9264108.pdfIn PDF document text
    • http://wekanisa.scienceontheweb.net/kakanukuzuguwemibebimax.pdfIn PDF document text
    • https://luxefelukij.weebly.com/uploads/1/3/0/7/130775337/gogafafize.pdfIn PDF document text
    • http://zofazosedam.iblogger.org/66676931721.pdfIn PDF document text
    • https://mefifusefom.weebly.com/uploads/1/3/4/2/134266023/pikoporezi_wolenedofa_nejutogitivome_rovusivafox.pdfIn PDF document text
    • http://somenem.iblogger.org/pimapabasufejizuxasuv.pdfIn PDF document text
    • http://kotizegosopi.22web.org/39709573182.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/ecs_mcp61pm-hm_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nusemid.rf.gd/major_theme_in_the_crucible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ca951a-f245-47b5-8218-0b2d787df202/how_to_send_a_tableau_packaged_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870d9eee-12c8-4ea2-839e-0da19644b4fb/ukulele_chords_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e1d93f-07df-4012-b919-08bcf8682fe2/39079001313.pdfIn PDF document text
    • http://josapug.epizy.com/4904070979.pdfIn PDF document text
    • http://saninov.epizy.com/land_co-_ownership_agreement_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f240659-55ae-4fc0-a025-4228ed5f73b8/can_diabetics_eat_starches.pdfIn PDF document text
    • http://musarozopod.rf.gd/51059819993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb64776a-9517-4454-9412-d82afc998fff/86712076615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8711881f-eb2c-4986-9861-3f0372d4b3ed/40394826242.pdfIn PDF document text
    • http://kusababi.onlinewebshop.net/femabutanadedefurif.pdfIn PDF document text
    • http://taguramol.rf.gd/1865866589.pdfIn PDF document text
    • http://wikatamuk.rf.gd/diagnosis_and_treatment_of_alzheimer_s_disease.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1886670a-bba7-4d2b-819b-7a2b17e3d9ac/fe_civil_reference_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 5492 bytes
SHA-256: c79c36f7811a2524e7bf8a89f8265cefb32d2c84c580be92cce3411b9a36f122
font_01_sfnt_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 10636 bytes
SHA-256: ec487646d04309271d93299cea3769343d34a18cbf499cc6e7d24f81e1b4ac80