Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f999feb38461342…

MALICIOUS

PDF

68.2 KB Created: 2021-09-17 14:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4949171d9202bb7471a7bb166d799f86 SHA-1: cd99a4e270f8264d73e032803da70850b0598437 SHA-256: 0f999feb38461342f3a768d76b4b4994eae18ec72d6cea7153f9957758ceba71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://archism.ru/uplcv?utm_term=john+wick+2+mp4 PDF link annotation
    • https://jck.ro/userfiles/file/gazatakenawafaz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319fd5545d8---daluxokuxomiwoxi.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/27001923547.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/zeletipoj.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/83812451614.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/rizetu.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/24820358409.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/fonovujijuwifoxovimujiji.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/wofoxakufi.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/59165419635.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/94898133814.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/60902944314.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/34f7d04325a2d65dda18ed17f4d7500b/fepopapufokumoberaluki.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/duwowegit.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vasikalurom.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/48155101730.pdfIn PDF document text
    • https://hotelcorona.ro/files/66021045611.pdfIn PDF document text
    • https://eniedu.com/data/file/20210909193735.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/77748990213.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/48281239921.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/7784309857.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/kazalixuxozinurozisivefut.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000add5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD5 10300 bytes
SHA-256: 2c27879f4c2275a23d3e2983216f78c50c44bf91a377add66b388a1be5e4bb0b
font_01_sfnt_off0000c4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F2 15312 bytes
SHA-256: ea8a459b5de5a926e17fe6c9bf2a73e0944ffd634f4dfe908f96140dd3c5d097
font_02_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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