Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a59c8b86582dae…

MALICIOUS

PDF

75.6 KB Created: 2021-02-19 18:39:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4d25b46ce4c4198aec00b9c6b525b68a SHA-1: 30370251090e21be123c1d2ee6c72d3a3d33ee75 SHA-256: 72a59c8b86582dae34d278f306354d04d0602af2866323f709dffd354b63b52e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=morton+whole+house+water+filtration+system+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407664/normal_5fdc13db5a88b.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/0Bhahgc/23624291279.pdfIn PDF document text
    • http://lozajakar.iblogger.org/admission_form_format_in_microsoft_word.pdfIn PDF document text
    • https://cdn.sqhk.co/jakatote/yrhB5gh/movagekabixepevox.pdfIn PDF document text
    • http://jebumivusesujan.iblogger.org/latest_bollywood_movies_free_hd_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_601e047643221.pdfIn PDF document text
    • https://kirejoji.weebly.com/uploads/1/3/1/4/131483098/pixekizofev-gidabaxus.pdfIn PDF document text
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/2486214.pdfIn PDF document text
    • http://allfreebets.ru/moulinex_brevete_sgdg_manualr0xkq.pdfIn PDF document text
    • http://itawomen.fun/bootstrap_checkbox_form_validationmc3nz.pdfIn PDF document text
    • http://zoompol.xyz/futefupetarulugajaxone1b6a.pdfIn PDF document text
    • http://kersita.space/13348483976qbj9f.pdfIn PDF document text
    • https://kuviwavu.weebly.com/uploads/1/3/1/6/131606254/08d20.pdfIn PDF document text
    • https://gubagomokugexat.weebly.com/uploads/1/3/3/9/133988684/lotoxavujelona-regexewukosopi.pdfIn PDF document text
    • https://cdn.sqhk.co/ledivure/giahfic/path_painter_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vemesivudaro.epizy.com/free_worksheets_on_body_image.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/zaporomev.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/zuvemepasiwozilulikifa.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/54803665399.pdfIn PDF document text
    • http://xadamun.epizy.com/fugajuwonavuxonugepasa.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_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 5204 bytes
SHA-256: 8e027eaab0258c14fe667dcd01f82bdf4bf845128dd3719d9cecabeda760759d
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 10604 bytes
SHA-256: 0ccd40d2ae143b5d79f04018c7f27d7602382ad74de49254e77aebf497d4e4be

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