Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18500fe8eb4a3a5…

MALICIOUS

PDF

81.3 KB Created: 2021-03-14 02:14:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 39ce5e933457355d96207437ad708b39 SHA-1: dc7d40c256786cbd43e17604166293d73f77b08b SHA-256: b18500fe8eb4a3a5cc59ccd6e078afc2aa909a4ff74ad31685e03fed5eb7cf0c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this intent. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=bible+verses+about+faith+and+love+pdf PDF link annotation
    • http://pubgmobiie.com/why_does_samsung_ice_maker_keep_freezing_upysk14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413454/normal_60058c7dbe8f0.pdfIn PDF document text
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/5426692.pdfIn PDF document text
    • http://operationhomeplate.com/bostitch_sb-1850bn_pricekeorx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_602ff048dac5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369324/normal_5fe2d190d8f9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_5fda96a4a91a7.pdfIn PDF document text
    • http://rimonevo.iblogger.org/civ_6_guide_rise_and_fall.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_5fd18c895ec79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_601b356155eda.pdfIn PDF document text
    • http://hotsales-com.xyz/college_hockey_scores_todayjm9ug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443588/normal_602f33d9ee8a5.pdfIn PDF document text
    • http://ygrash.website/32045953464i5xpb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444351/normal_6004fe05a994c.pdfIn PDF document text
    • http://kutagugiponapa.22web.org/wokifogevanukubegumozijez.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/xivenujip_jufogugakut.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/xejifi-fubemifatupebi-lomab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vanabigura.rf.gd/xemizorupizajalez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fade1ff0-83d2-4b4c-838b-4e75b5435fee/bawikudimeku.pdfIn PDF document text
    • http://bixevefosado.epizy.com/3756780724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1821302-feb9-4b84-aac2-08804e4516fd/22175673071.pdfIn PDF document text
    • http://vuremekewema.rf.gd/song_of_solomon_chapter_2_verse_3_meaning.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 5260 bytes
SHA-256: bbdd97a0f7d227fcfe9c49aed56f787b428ce104f1f6eaf48801f03007236e1a
font_01_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 10944 bytes
SHA-256: fe48ac36cca581153c16f0f0865dfa610f06bba486583c95eb10ffc7a31043cc
font_02_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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