Malicious PDF — malware analysis report

Static analysis result for SHA-256 347bb04ec2bdb371…

MALICIOUS

PDF

76.2 KB Created: 2021-06-06 05:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f86ca2383d12030ada53000d0e95c95e SHA-1: b77375fcb44d633f1d8bd058321e7175616583d1 SHA-256: 347bb04ec2bdb371073fe7e48fc932cc08e61605661e1afe3d26670ad087ea65
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to disposable domains, suggesting a link farm designed to distribute malware or phish for credentials. The document body, though heavily obfuscated, appears to be a lure related to exam papers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crysiq.ru/pbw?utm_term=grade+9+english+fal+exam+papers+and+memos+2017+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382948/normal_5ff77ff7c8ba0.pdfIn PDF document text
    • https://mivagefe.weebly.com/uploads/1/3/1/4/131453450/vanugezemateniw_zowemusofijozot_danaputoj.pdfIn PDF document text
    • https://xugowumilivave.weebly.com/uploads/1/3/4/8/134846580/wurigon-fezitapakijara-tuzilumu-wosazitubum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_6061efa566c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_60350045c442a.pdfIn PDF document text
    • https://febosefukeja.weebly.com/uploads/1/3/5/3/135324858/6928313.pdfIn PDF document text
    • https://fafapiponuge.weebly.com/uploads/1/3/4/6/134692005/pizibukitata.pdfIn PDF document text
    • https://wizaxonaguwaxi.weebly.com/uploads/1/3/4/3/134306690/xisumuzaruka.pdfIn PDF document text
    • https://rigasalimuf.weebly.com/uploads/1/3/4/7/134703392/9659685.pdfIn PDF document text
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/3962891.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/401bd805f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipoziw.pbworks.com/f/microsoft_access_2020_tutorial_free_download.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/givitavuwudiwojofamuduw.pdfIn PDF document text
    • http://tereburokofe.pbworks.com/w/file/fetch/144628230/vilanufijufinunovas.pdfIn PDF document text
    • http://gitizuxob.pbworks.com/f/21701910606.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144419499/xikegofoxa.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/43750915671.pdfIn PDF document text
    • http://pikalunik.pbworks.com/f/practica_forense_civil_y_familiar.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/56672569474.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144452340/sadlier_vocabulary_workshop_level_b_unit_6_answers_synonyms.pdfIn PDF document text
    • http://neruwuk.pbworks.com/f/desarrollo_de_habilidades_directivas_whetten_8_edicion.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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 6116 bytes
SHA-256: 008ea908dfca33171baec5bebc99774eb17a01021a2102edb7267166951addfc
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 13852 bytes
SHA-256: 542c497f002a1c0fe1d6fc4101137c4ff1f363ec39421fb2068eff360134183a

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