Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1fe946b45fa783…

MALICIOUS

PDF

79.8 KB Created: 2021-03-24 16:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 35d85b977e643a863e132f5361782ecc SHA-1: bdf045fe58cfda1ba3eb970fe14fd48793f65646 SHA-256: da1fe946b45fa78305691f62a8333895d12f81fe3768c2e966f4137c904b25a9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting. The primary malicious URL, 'https://jottigo.ru/award?keyword=colite+amebiana+pdf', suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jottigo.ru/award?keyword=colite+amebiana+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450244/normal_60561c189be39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5fcdd5f7d17ad.pdfIn PDF document text
    • http://rutetasilatigo.iblogger.org/36407844029.pdfIn PDF document text
    • http://dommasters.site/kepubqiumq.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/geihhiW/planets_in_order_from_the_sun_mnemonic.pdfIn PDF document text
    • http://instahelpforbusiness.com/2357570417tdc2m.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/hiiw50A/bicycle_track_racing_crashes.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/3865538.pdfIn PDF document text
    • https://fulewopopewu.weebly.com/uploads/1/3/5/3/135323857/fupunonolil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_600d3ee9a75c7.pdfIn PDF document text
    • http://rating-bookmaker.ru/il_vangelo_apocrifo_di_giovanni965jj.pdfIn PDF document text
    • http://vigorutijiwek.22web.org/quadrilateral_properties_matching_worksheet.pdfIn PDF document text
    • https://tajuboramaze.weebly.com/uploads/1/3/4/5/134591815/7528206.pdfIn PDF document text
    • https://cdn.sqhk.co/bodevoposuji/vificjj/local_spots_in_las_vegas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jatitubez.epizy.com/grade_4_addition_and_subtraction_worksheets.pdfIn PDF document text
    • http://pubupetedibu.rf.gd/mechanical_engineering_technology_associate_degree.pdfIn PDF document text
    • http://dusuwuf.rf.gd/88792078012.pdfIn PDF document text
    • http://subuxobudigaka.epizy.com/cacaoweb_pour_smartphone_android.pdfIn PDF document text
    • http://sozejegisiwex.epizy.com/campbell_hausfeld_6_gallon_air_compressor_manual.pdfIn PDF document text
    • http://newigumumakewi.epizy.com/how_to_integrate_arcsin_x_by_parts.pdfIn PDF document text
    • http://sozizuw.rf.gd/centrifugation_types.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_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 4960 bytes
SHA-256: e0c83edab6211bc794aa37abba906eecbc42bcadc64b82da004879b8de5a4c60
font_01_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 12416 bytes
SHA-256: 184bb065975cbce7aed98595d9afa2c130d4f0895a9c5a1cc98613c770e11e01