Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4ca3b02031c3fa…

MALICIOUS

PDF

79.3 KB Created: 2021-03-29 06:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d0209b9532b9dea6d62695b8e98a9474 SHA-1: 2a464350472caca8bd44e584c70b5d446fe08aad SHA-256: cf4ca3b02031c3fae8293aacaf6cd94513b60213a1832705fcee5880252d8137
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to 'jottigo.ru', which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/award?keyword=best+pdf+ebook+reader+ipad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502511/normal_602d1f0f1a9f7.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/8idijgd/ice_cream_cone_puddle_jumper.pdfIn PDF document text
    • http://volosaty100.xyz/zerowilojibofagw2yf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5fdbe37aa3611.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/Ciggdjb/migaboleb.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/ihgi7gj/gitamofemez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470024/normal_6003afb5d4501.pdfIn PDF document text
    • https://cdn.sqhk.co/telivagawu/ephcjec/radiation_island_ios_free_download.pdfIn PDF document text
    • http://espacecmb.xyz/foregafosajosajurxvhmb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_5fdbd19c03e2d.pdfIn PDF document text
    • http://lofitner.buzz/roms_emulator_psp_androidixwuz.pdfIn PDF document text
    • https://cdn.sqhk.co/dipimimimewi/8ijjggc/75515753564.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/jokotaziweluge/zelobi.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_6e0adceb4a6c4ae3bad614fd9f9d2c7d.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_fff01ab877a44f2c8e9ec39c03a4b281.pdf?index=trueIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_f31f1fa015224b74b62cbf5270c0356d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/spider_man_2_game_pc_softonic.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/kijirijavolokuwilodiwoje.pdfIn PDF document text
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_8883472bcd374eb7b6d9bd956d95bcd0.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_0646cab09721423ba2d082b54a7f1174.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/watajive/43769560802.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_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 5256 bytes
SHA-256: 2a83872716464e0353347cf04321878dcd85b0a8e66cbe92388b0cb5951d18d3
font_01_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 11256 bytes
SHA-256: bd0d6d30f47c7225880d746f1eaa6d159e1dd1051933cafb9cf38a7fcfa6c53e

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