Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c6386abb0368b6…

MALICIOUS

PDF

81.4 KB Created: 2021-01-24 17:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 05d93dd21d00a9986daddcc48aa1eac1 SHA-1: 0b96ebfca226c447d7c6d07cf186569f75a3a317 SHA-256: 47c6386abb0368b62b4838949713a1d3c7a3fd0ad943b1a49a1964c18adc9087
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'best brown mascara 2020' and 'wkhtmltopdf', indicating a potential lure to disguise the malicious intent.

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://druttle.ru/123?utm_term=best+brown+mascara+2020 PDF link annotation
    • http://geguxejap.22web.org/34436734801.pdfIn PDF document text
    • https://mebijanuwirat.weebly.com/uploads/1/3/4/0/134042853/4891980.pdfIn PDF document text
    • https://beteviduzil.weebly.com/uploads/1/3/3/9/133986260/bogiwavoni-mogevope-luxig.pdfIn PDF document text
    • https://sapefesoj.weebly.com/uploads/1/3/1/4/131453354/jivifateruj.pdfIn PDF document text
    • http://dorightunion.com/22725592063uds1n.pdfIn PDF document text
    • https://cdn.sqhk.co/joraxeneli/gf9egjm/13575295905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fd7bf731255a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403120/normal_5fe305990bdf3.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/6961320.pdfIn PDF document text
    • http://mafuditovu.iblogger.org/wuvepemujokomipopewusolo.pdfIn PDF document text
    • http://vemasujananexu.22web.org/xogagopolimeroxufolotun.pdfIn PDF document text
    • http://excschool.ru/58428559048hetd4.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/jtAmBjc/shelter_from_the_storm_chords_bob_dylan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zafurug.epizy.com/59087271000.pdfIn PDF document text
    • http://nabotiwufonego.epizy.com/st_bedes_lanchester_sixth_form.pdfIn PDF document text
    • http://lunijikujapike.epizy.com/cartoon_network_movies_in_tamil_free.pdfIn PDF document text
    • http://mujusitajal.rf.gd/kolimejopitobupisadov.pdfIn PDF document text
    • http://denaruzunus.epizy.com/ysoft_safeq_installation_guide.pdfIn PDF document text
    • http://vukefuxi.epizy.com/69970174731.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_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 5468 bytes
SHA-256: 1ba7074994aa4bede74c2ab9a535f92982d09225298c891328a802d31d7ce891
font_01_sfnt_off00011340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11340 10956 bytes
SHA-256: accf0feec1b8b455fdae6115231952bcb3d0e7926589e4e3b94e3ab7810b3428

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