Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e51d0d4278710e…

MALICIOUS

PDF

81.0 KB Created: 2021-02-19 12:32:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 95ed763f36fa1014db7619ada5a88867 SHA-1: 256e6b54bde5e8c2d87e13924757581b9dbe7758 SHA-256: c5e51d0d4278710ed02fd39b7839bf8462b5bbc572fe33f29394f25d2538cc31
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to contain a search query, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=how+many+bullets+does+a+bersa+380+hold PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417413/normal_5ffd392474184.pdfIn PDF document text
    • http://beststudent.space/male_anatomy_drawing_guide42j8m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_5fdc4dad0986f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404512/normal_600f426d348ca.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/QbmggVU/ear_piercing_gunshot_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_602e6e996db6b.pdfIn PDF document text
    • http://help-ruleviolation.com/centering_spreadsheet_horizontally_excelfzu4m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_6013e2bd9d46d.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/czJnNja/gridiron_guys_owner.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367903/normal_5ff2bb3672b9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469359/normal_5ff3d879b16c6.pdfIn PDF document text
    • http://pedrons.space/what_is_healthy_at_bojanglesnh34c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467032/normal_601046be36b73.pdfIn PDF document text
    • http://perevod24-card2card.site/oil_price_live_charto1r36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462732/normal_5ffa52100fa50.pdfIn PDF document text
    • http://chambrehq.xyz/free_color_sheets_unicorns4chxr.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/UTigghp/lojidedalotefoloximuxalu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://savejanaxejov.rf.gd/vidokividomesobu.pdfIn PDF document text
    • http://fogivezin.rf.gd/renonuxupinarilogajovi.pdfIn PDF document text
    • http://repajazofuwide.epizy.com/architect_cv_sample.pdfIn PDF document text
    • http://fulariponazaget.epizy.com/chavela_vargas_la_llorona.pdfIn PDF document text
    • http://lovenewaw.rf.gd/tanupoxulo.pdfIn PDF document text
    • http://sotexazonilot.rf.gd/tamogusap.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_off0000fc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8F 5860 bytes
SHA-256: b1906d32bc6566f96fce962b07710665005f21722fc6b73e5745dc62b605e05c
font_01_sfnt_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 10992 bytes
SHA-256: 961a4f23120321b5815dbfb8791abe7361b637a849c9dcfe585652e2a463c30e

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