Malicious PDF — malware analysis report

Static analysis result for SHA-256 9538ca640d6895be…

MALICIOUS

PDF

70.2 KB Created: 2021-02-26 12:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e47dbccd992d9f5daeb3b6cbf2b7e88a SHA-1: 14f80620af86fcba09cb69c25638565cf0e4fb88 SHA-256: 9538ca640d6895be9e1cb1fb0a281bbfc69f26a5026846bb631d9d9563a6cbfe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://nipisod.ru/award?keyword=how+to+charge+a+polaroid+spectra+camera PDF link annotation
    • https://cdn.sqhk.co/vabalogu/aaheu0D/24903627886.pdfIn PDF document text
    • http://5-euro.info/gafikuwojoxubokiv3vqwh.pdfIn PDF document text
    • http://service-hire.com/vinisivotabedinun0hl5v.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/jhhaUhd/25137018159.pdfIn PDF document text
    • https://cdn.sqhk.co/vekosozob/nohhid1/9338257120.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/f8H7pBf/xofupibavitotiluwiboke.pdfIn PDF document text
    • http://questotzvezd.space/how_do_penny_stocks_work_reddit106id.pdfIn PDF document text
    • http://aazzzry.space/aurora_hdr_2018_fullmm79f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468831/normal_603888364758f.pdfIn PDF document text
    • http://trackengine.host/74715310032f790b.pdfIn PDF document text
    • http://ramerofebib.iblogger.org/consumer_reports_on_samsung_fridges.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/sazariwapa/thomson_ielts_practice_tests_listening_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/blue_coat_sixth_form_application.pdfIn PDF document text
    • http://sabukizazuse.epizy.com/manaslu_trek_without_guide.pdfIn PDF document text
    • http://vikibolo.epizy.com/sawutitugugogomivelawu.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_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 5540 bytes
SHA-256: 6ee7377b145b544e33c46657ad285c8aab985520abe18a8d80b6f2c07787cb3f
font_01_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 10732 bytes
SHA-256: 12f520ebeef65071a5f9e911b63aac5c60b9ebc1f7f59924f5f5d1d392c4ee30

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