Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e68e6e16049309…

MALICIOUS

PDF

76.6 KB Created: 2021-04-28 21:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 621a4d8ed8fa28e67a9192cbe9475cee SHA-1: 255281a8577ef131d4fa87f4314cb005810f793f SHA-256: b2e68e6e16049309328330f14dfdb4f9b874ba1c1c797927969f40c89519df9d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, with one prominent URL pointing to `https://golowaki.ru/strik?utm_term=define+legal+term+fighting+words`. This suggests the document's primary purpose is to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

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://golowaki.ru/strik?utm_term=define+legal+term+fighting+words PDF link annotation
    • http://tupujetu.sportsontheweb.net/68356306904.pdfIn PDF document text
    • https://lotaximadezepa.weebly.com/uploads/1/3/1/3/131379514/9310602.pdfIn PDF document text
    • http://lebojabufi.medianewsonline.com/arduino_ide_software.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/agenda_escolar_2020_para_imprimir_gratis.pdfIn PDF document text
    • http://retoxen.mypressonline.com/blueprints_psychiatry_free_download.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/8343566.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/95571167497.pdfIn PDF document text
    • http://ladirojenovezoj.mygamesonline.org/73088379670.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/ESCUUjg/xirosovumesupej.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/gqk7hhw/tanukaziw.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/ghsRkYk/93283832847.pdfIn PDF document text
    • http://sidodawoleze.iblogger.org/zoburagobipanunaremox.pdfIn PDF document text
    • https://bixarina.weebly.com/uploads/1/3/1/0/131069915/4da6919ba196ff.pdfIn PDF document text
    • https://tigobatimomovo.weebly.com/uploads/1/3/2/7/132740361/tetadijukevul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_23957a5cf5c446209e567a6c3971e91e.pdf?index=trueIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_53fc0187368e42638016adea92b2ae60.pdf?index=trueIn PDF document text
    • http://kigokigaruv.myartsonline.com/what_is_the_enthalpy_change_of_a_chemical_reaction_that_raises_the_temperature_of_250_ml.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/anti_architecture_and_deconstruction.pdfIn PDF document text
    • http://buwopupewu.epizy.com/12172878429.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_a1d7bd0d545746e7ba796cff85105975.pdf?index=trueIn PDF document text
    • https://f9cb7010-568c-45d0-b0a5-7bd630b60272.filesusr.com/ugd/b10ea2_fb5b38b75bbf4b9b8904d1e36a3ba6cb.pdf?index=trueIn PDF document text
    • http://moniladipawi.epizy.com/partnership_deed_form_e.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_4697002fdddd4e129e66fe8036296c23.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_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 5412 bytes
SHA-256: 822c76400c48486883e6ad68adc32a7e6e330c61695451b3fe80fbee6def97ef
font_01_sfnt_off0000ff51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 11036 bytes
SHA-256: 48ff3a215bf42067d8a708d956513a1d9049fbafcc3fcba52129618911630dca