Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4c0df9672a257c…

MALICIOUS

PDF

82.8 KB Created: 2021-04-23 03:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 41d1f17d9b37b3f94a11345b1ac1ad75 SHA-1: 9be4277fa475217672336545a08655ff697c8fd2 SHA-256: 6c4c0df9672a257c707d5c6ccaae12df312cdd5a00c41d76018a7f353d70ff1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and the link farm nature suggest an attempt to lure users to malicious sites.

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/strik?utm_term=men+women+and+chainsaws PDF link annotation
    • http://soxetav.iblogger.org/broken_vessels_g.pdfIn PDF document text
    • http://dnepr24.info/wawimokiruvedawetopil25gdy.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/structure_of_benzoic_acid.pdfIn PDF document text
    • http://vanlit.ru/dusoxup6hxog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_6030fef168290.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/dusupew.pdfIn PDF document text
    • http://girlita.space/nike_air_force_1_high_top_dressf7q2s.pdfIn PDF document text
    • https://bilugejedegigel.weebly.com/uploads/1/3/4/0/134017605/zufipimumuboxonanan.pdfIn PDF document text
    • http://pufegusikozig.22web.org/shankar_dada_mbbs_songs_free.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/goperot.pdfIn PDF document text
    • http://jigatinapa.22web.org/tikilotezuleforos.pdfIn PDF document text
    • http://lupaper.22web.org/kiroxadumilafiliwazowizud.pdfIn PDF document text
    • https://funoridarudaru.weebly.com/uploads/1/3/5/3/135304061/wunidukix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392453/normal_60048f66dec46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dasufolizimifub.rf.gd/fisher_and_paykel_icon_premo_cpap_machine.pdfIn PDF document text
    • http://gujimimokogofe.rf.gd/sevudaxupolewujodadal.pdfIn PDF document text
    • http://muresapidun.epizy.com/zekilazegipibugavowazunu.pdfIn PDF document text
    • http://gadaropi.epizy.com/additional_mathematics_for_west_africa.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/business_environment.pdfIn PDF document text
    • http://gakuxalodakedaj.epizy.com/earth_abides_audiobook_download.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_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 5148 bytes
SHA-256: cdb54572e18538a75e2e0a0eb82f606a08d10f9330c37b8fda16559c1b6d1e0e
font_01_sfnt_off00011982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 10592 bytes
SHA-256: c8b0de3728e195e7eddbca576332236f102e96bcef15de26e3887eecfa7a06e2

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