Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d720307e7dc6bb2…

MALICIOUS

PDF

90.8 KB Created: 2021-03-04 10:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 73bfa9a3035d465778dd1432771ab01c SHA-1: aaa15fef276f24cbf75af470c69011a0d13d5283 SHA-256: 8d720307e7dc6bb25b0a6a774b750723e817713e750201706bae12a98f312cb6
126 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including external URI links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious content. The document body, though heavily obfuscated, appears to be a lure related to a book report, directing users to external URLs for further action, likely to download a second-stage payload.

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://vilenefex.ru/award?keyword=lord+of+flies+book+report PDF link annotation
    • http://slamelina.website/895867513291c76o.pdfIn PDF document text
    • http://hq-cleartv.info/shadow_runner_snes_romkv2lu.pdfIn PDF document text
    • http://idealslimitaly-official.site/110500947587spak.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/bdb346b26c7e.pdfIn PDF document text
    • https://jetezoxow.weebly.com/uploads/1/3/1/3/131379231/gegigug_nusopaxuwal_wagas.pdfIn PDF document text
    • http://pejelurim.getenjoyment.net/tokyo_ghoul_season_1_opening_song_name.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/mevekidupe.pdfIn PDF document text
    • http://peteferix.mypressonline.com/vasozenodejozimunutezu.pdfIn PDF document text
    • http://bred-enligne.com/java_tutorialspoint_free_downloaddiykb.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/dafububi1slq7.pdfIn PDF document text
    • https://bokuwiziwa.weebly.com/uploads/1/3/4/0/134042705/4068989.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/sopeto.pdfIn PDF document text
    • https://womevelem.weebly.com/uploads/1/3/2/8/132814223/sotewozizobul.pdfIn PDF document text
    • http://rabiwitijif.medianewsonline.com/marebadexat.pdfIn PDF document text
    • https://degujipimisa.weebly.com/uploads/1/3/1/4/131453395/63aed29c635d.pdfIn PDF document text
    • http://erogan-encolumbia.site/tisonedesutebuzullnwp.pdfIn PDF document text
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/6689891.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/mulerux/xixerekugibiwekenemapamo.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_off00012a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A07 4972 bytes
SHA-256: 3f145adf091e23c211d8dfdb961e11dfbc3bd2c05d1fc2c0d4f729a04af24963
font_01_sfnt_off00013b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B03 10160 bytes
SHA-256: 63f02b43b33d4b3bf1838c474f8e4ca40a67b61a25350568ad6999982e12d13e

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