Malicious PDF — malware analysis report

Static analysis result for SHA-256 738ec531895c7797…

MALICIOUS

PDF

76.9 KB Created: 2021-02-27 11:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 25e0664db8a5ac8a41008e6b19dc9245 SHA-1: da0ac110b2b5e36ff64efddbf174683fab8ce91b SHA-256: 738ec531895c77970acb1fcd770ec0d97ce9cf201d9fec960d2fc3e18c23509b
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to obscure the true destination by using link farms and disposable hosting, likely to distribute further malicious content or conduct phishing.

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 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://dugedepap.ru/wix?keyword=christmas+vocabulary+crossword+pdf PDF link annotation
    • https://zuligenewem.weebly.com/uploads/1/3/4/7/134749141/femumofujajudakew.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/67184025281.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/77353445437.pdfIn PDF document text
    • http://abreudesigns.com/prevent_submit_form_javascriptgckmg.pdfIn PDF document text
    • http://strgb2.ru/amended_tax_return_2016_formia1o8.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/42595889917.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/jifUYja/32892490395.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/BdrP0jj/dizep.pdfIn PDF document text
    • https://kikurebimeko.weebly.com/uploads/1/3/0/8/130814200/zojifewenumosepe.pdfIn PDF document text
    • http://rocketdocs.us/12632567082tk196.pdfIn PDF document text
    • http://iranianvc.com/how_to_crochet_a_beanie_step_by_step8sb5j.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/eZQPdia/37452991378.pdfIn PDF document text
    • http://komarovskii.xyz/92304986844sf6ny.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/alpha_word_in_urdu_alphabet.pdfIn PDF document text
    • https://lafitezin.weebly.com/uploads/1/3/5/3/135323108/2e9155823cc15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/the_apology_of_socrates.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_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 5692 bytes
SHA-256: 64c63eefde90b1166cc2d1f74863a3cf7d126f9a35dff47a24d5a0331fbe75cb
font_01_sfnt_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 10476 bytes
SHA-256: bbfbe33030c7ac13f7234aa9676cf7858fafa52e0b9eb072d27ebc6e5d7b127c

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