Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c3139176bc75da…

MALICIOUS

PDF

94.4 KB Created: 2021-04-10 05:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 74f8db6e984a946274fe565990493364 SHA-1: bdeb4a8eb5c39ce3accdecd5deabc9671b835b49 SHA-256: 61c3139176bc75dab42b1098fba06d0f556a8819a42d9305f474cb8f2a5d124a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=what+statement+summarizes+the+main+idea+of+reciprocal+determinism PDF link annotation
    • https://vafumuwolefuz.weebly.com/uploads/1/3/5/3/135325426/b3a5b0083.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/branding_and_packaging_decisions.pdfIn PDF document text
    • http://legko.travel/how_much_money_do_you_need_to_start_a_hedge_funda4kky.pdfIn PDF document text
    • http://lobuzef.iblogger.org/turupatexuvudivuni.pdfIn PDF document text
    • http://narewenu.22web.org/military_athlete_sfas_prep_guide.pdfIn PDF document text
    • http://copyrighthelpcentral.com/grammatical_structures_in_english1afab.pdfIn PDF document text
    • https://jozegolufipiz.weebly.com/uploads/1/3/0/7/130776065/luderopameri.pdfIn PDF document text
    • http://nout-sale.site/wooden_surfboard_plansik88g.pdfIn PDF document text
    • http://smotrikino.fun/xovopiwikimew5dn0d.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/profeco_agua_alcalina.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/bd57b00.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/47489222286.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/Dicugh2/buriwise.pdfIn PDF document text
    • https://cdn.sqhk.co/susononuz/hjhcjad/91836170036.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/5285724426343uwg.pdfIn PDF document text
    • http://buytoday.cc/xepixisoz0dl1y.pdfIn PDF document text
    • http://sodaapp.club/21002148600p8m2l.pdfIn PDF document text
    • https://mokugutareno.weebly.com/uploads/1/3/1/6/131606089/vivebajufot.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/60149768733.pdfIn PDF document text
    • http://noverst.xyz/remove_password_from_excel_2016_sheetqetgp.pdfIn PDF document text
    • http://sasawavivar.mygamesonline.org/raven_botanica.pdfIn PDF document text
    • http://genusadnlo.space/ejercicios_de_mecanismos_2_esoy9vnz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dobusimosekaba.epizy.com/sijiboref.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_off00013418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13418 5456 bytes
SHA-256: 33ea120caa391f9223788d68250c5184e641cbb67dab5dc05050389a69c158e4
font_01_sfnt_off00014695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14695 10908 bytes
SHA-256: 33796e69c1c8c2bda75cb15eff2c595bc4007b59d8fbb3180fffc3275e300e4b

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