Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2528d204409cfa9…

MALICIOUS

PDF

79.3 KB Created: 2021-05-21 21:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f87a1c6056f94487ab63687269f0bde1 SHA-1: 928d40cefc899fd7d148fa4230fa2ad87a60cb63 SHA-256: b2528d204409cfa95ef0b88a1215ec9be0929801acdaaad308eef54166383c14
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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 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.
  • 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://mezovuduw.ru/strik?utm_term=how+can+i+record+facebook+messenger+audio+call PDF link annotation
    • https://damowovevibip.weebly.com/uploads/1/3/0/9/130969764/317460cf.pdfIn PDF document text
    • https://zefemebok.weebly.com/uploads/1/3/0/7/130775969/365605.pdfIn PDF document text
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/164ba76e16d1.pdfIn PDF document text
    • https://fibumexil.weebly.com/uploads/1/3/1/0/131070733/fenugodonibizisa.pdfIn PDF document text
    • https://zuxutupod.weebly.com/uploads/1/3/4/5/134587355/3593752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_60307c264e05e.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/0a4bb68fd17d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_6033240c1c1b0.pdfIn PDF document text
    • https://jukusixod.weebly.com/uploads/1/3/1/4/131483076/8a02ac5a63a.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/dudigonifu/35460866639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dcaf78c-e1a1-4eb8-970c-e902b13bb060/whats_a_chicken_cutlet.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/jawbone_bluetooth_headphones_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/jonubu.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/52258083498.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/varofifopawetiwuboxib.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/the_imitation_game_tamil_dubbed_movie_download_isaidub.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/uniform_store_in_southland_mall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43adf450-5fa2-4f4e-8ed5-b0386ccc545d/altered_carbon_season_2_ending_dhf.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/bed_sheets_and_comforter_set_queen.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/nazugakasukitowe.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_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 5600 bytes
SHA-256: 99eadd3985de190ec5ff1c16797dfb5c3a3b07cc5cfa1b80b3a1d745f3c54f62
font_01_sfnt_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 10744 bytes
SHA-256: 9ffdc1137e100f3a5ec490638079b974dcee7422448d880d97b7f2470ac6870f

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