Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34f5098f72e48c1…

MALICIOUS

PDF

72.9 KB Created: 2021-04-03 18:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e66f7d810b5c59ddb5814c32f9f89a86 SHA-1: e940c28f6a6cc97fff8609ea69aef3158b5bfac6 SHA-256: c34f5098f72e48c11b5cbce7b9c182e427a0035f91779bce657a631e5d54b24e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=polarization+physics+pdf PDF link annotation
    • http://tactical-jacket-sale.shop/wuvotivosasequpow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413968/normal_605ca2e7140fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_603cbc49e3913.pdfIn PDF document text
    • http://lbaranaydin.com/mgla_con_corazones_hacia_ninguno_piekocl2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_6054fb41a4aeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fdd96e01fe61.pdfIn PDF document text
    • http://coins24h.com/fujoxideweziburosedexerxb4ak.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/antitussive_and_expectorant.pdfIn PDF document text
    • http://erogan-columbia.site/canon_lide_120_scanner_specificatione2phj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5fd258a61b5bc.pdfIn PDF document text
    • http://metalllift.ru/81531898706vael.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368971/normal_60560310a3c42.pdfIn PDF document text
    • http://reabook.online/69691433288toxfv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dozuga/srimad_bhagavatam_in_telugu_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/vsco_mod_apkpure.pdfIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/how_to_set_a_honeywell_thermostat_on_auto.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/bokojijure.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/tawagefirizokafaxipeserez.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_off0000e0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 5396 bytes
SHA-256: fb8a75e5b9a1c22e40e657f9a1af2260ca5aae4ee6019dfc8e8bcd3f3a925f3e
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 10376 bytes
SHA-256: dbc10d2db49e164255fa96dbb4700ef200ace86fa8a83216657e57ee70929759

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