Malicious PDF — malware analysis report

Static analysis result for SHA-256 97605cf6d8ff5a78…

MALICIOUS

PDF

76.5 KB Created: 2021-03-25 21:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3759c223f75eca76dc476f932aa46383 SHA-1: 1e7a4eafaee199d860fd4ae448330af10a24bf90 SHA-256: 97605cf6d8ff5a78a044ff8ab00f8c169445a229673b539655176a7cccdefc44
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains keywords related to 'critical thinking in nursing' and the authoring application 'wkhtmltopdf', indicating a potential lure. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly indicate malicious intent related to link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/aws?utm_term=how+to+use+critical+thinking+in+nursing PDF link annotation
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/5502165.pdfIn PDF document text
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/lenetigajurufal.pdfIn PDF document text
    • http://discout.online/best_space_warfare_bookski7bb.pdfIn PDF document text
    • https://jozisanolotodix.weebly.com/uploads/1/3/0/9/130969335/tizegudexidid.pdfIn PDF document text
    • http://covidcapsule.world/71608686966yik2s.pdfIn PDF document text
    • https://mutefalififide.weebly.com/uploads/1/3/1/3/131383766/0e611.pdfIn PDF document text
    • http://kreativoblako.com/69262485674b4l3z.pdfIn PDF document text
    • http://metikinave.22web.org/baton_rouge_business_report_staff.pdfIn PDF document text
    • http://lnstagramcentre.net/gm_diet_day_1_headache7js2q.pdfIn PDF document text
    • https://xawuvokepixa.weebly.com/uploads/1/3/4/6/134617960/6448031.pdfIn PDF document text
    • http://reduslim-italy.site/35437534259ygsb3.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/edb44f92-16f1-40b7-8431-441709de0e30/weber_spirit_e_210_2_burner_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05659903-d26a-46e8-a7a9-6bf2559b54ad/la_gallina_degollada_los_personajes_principales_y_secundarios.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/37115431077.pdfIn PDF document text
    • http://zoguwazor.epizy.com/missguided_satin_cowl_neck_maxi_dress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f46edad-d2c4-46c0-9507-7656fd84c643/33718097259.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/lincoln_navigator_2008_owners_manual.pdfIn PDF document text
    • http://jajoxutevo.epizy.com/nutricion_parenteral_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/54555914408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4803f036-0618-4df2-a7ca-2ce3b1f395df/pioneer_avh_x1600dvd.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/40474383485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d0097c-3a99-4eaf-8826-5e3181d850ab/xigifeverikuvegup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7313fe-33ed-4e2c-8b9e-13edf2273fbc/jolemas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79669685-2683-4f0a-90a6-f3510fbc97c2/warehouse_safety_tips_osha.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf89c9c-b678-4976-88d3-1d5d03b15a81/5_languages_of_love_test_for_couples.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_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 5176 bytes
SHA-256: 0d9df7ba66a4e71ddf688aa436c89507b2806ab6369caf853313417441116a05
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 10948 bytes
SHA-256: 262a69a7781bbbb89d77fcc8c2f7582efdc6ca52fc0eacfe02ea97c5c2202661