Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b683768eac1fa3b…

MALICIOUS

PDF

77.1 KB Created: 2021-03-21 02:36:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ffad3497312b9d2c9e6c37df894ca6cf SHA-1: 116922da816cb4f21db0aaa55c008cdbd9aaaa23 SHA-256: 7b683768eac1fa3bd5f0471af8777fddc2967d71b9be098c910e1ee74de38945
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://botokaw.ru/strik?utm_term=dead+and+gone+book+read+online PDF link annotation
    • http://health2health.online/rebirth_mr_wang_gameplayh4gao.pdfIn PDF document text
    • http://vvinorama.fun/mckenzie_exercises_for_lumbar_herniated_discigdku.pdfIn PDF document text
    • http://instup.xyz/witcher_3_wolf_school_gear_part_3gxd39.pdfIn PDF document text
    • https://rosififobagas.weebly.com/uploads/1/3/1/1/131164218/jiruzulemobe.pdfIn PDF document text
    • https://vavawuzozut.weebly.com/uploads/1/3/1/1/131163550/xunofexu-tanivozexuv-nugepakumixijix-garerufunigoj.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/6725ed82e.pdfIn PDF document text
    • https://fovezifume.weebly.com/uploads/1/3/0/8/130874198/bonog_duguwarun_kokevarexo_zuwuwozosutezof.pdfIn PDF document text
    • https://sixisamut.weebly.com/uploads/1/3/5/3/135308299/5527505.pdfIn PDF document text
    • https://jufoximivovanad.weebly.com/uploads/1/3/4/0/134013024/tubobozipukuwadowex.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/jelulo.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/baldurs_gate_3_multiplayer_waiting_for_otherss4ygn.pdfIn PDF document text
    • https://xadixifiv.weebly.com/uploads/1/3/4/8/134888816/1446770.pdfIn PDF document text
    • http://stroiline74.ru/simamujaropotokibudafabux8yula.pdfIn PDF document text
    • https://zolerowiz.weebly.com/uploads/1/3/4/6/134691656/zerosofamawowume.pdfIn PDF document text
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/fodorozuneva_jugilunaduwufit_wonuvofo.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/c91405c70ca.pdfIn PDF document text
    • https://siwuluwavati.weebly.com/uploads/1/3/4/7/134756127/907ab7.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/zakunafu/pulozesuxes.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/audio_video_converter_for_android.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/fufifudu.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/jidar.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_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 5016 bytes
SHA-256: 4d8a36629ab616005b9f3a82b669ac694b336ee75d23799c6d2a5f6e85aff093
font_01_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 10508 bytes
SHA-256: 4212e6e4d9c3470d8f39f9c2d5d0b20da77a1b2a27d3237f94c5c2ddac8f7d48

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