Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc65570cdb3bf45…

MALICIOUS

PDF

76.2 KB Created: 2021-03-27 17:07:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 67a38dcc7a88c67c955cd9ac88e575d4 SHA-1: c28da695b1b21c6959f5a5749a3025c527d053e6 SHA-256: bbc65570cdb3bf45d9d7c000cb4838a2a2054647783438c6800169573a132d4a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious lure.

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://druttle.ru/award?keyword=arriscando+a+propria+pele+taleb+pdf PDF link annotation
    • http://tuwasukam.getenjoyment.net/goldfinch_by_donna_tartt.pdfIn PDF document text
    • http://nawitebexu.medianewsonline.com/92532597841.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/gst_annual_return_form.pdfIn PDF document text
    • https://zaxefuki.weebly.com/uploads/1/3/5/2/135299090/e011675935ec73.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/15501424178.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/30311ef41b8.pdfIn PDF document text
    • http://totipuzuforaz.mywebcommunity.org/beauty_salon_services.pdfIn PDF document text
    • http://difipalilif.scienceontheweb.net/how_to_find_old_judge_mathis_episodes.pdfIn PDF document text
    • http://vakiduweg.mygamesonline.org/wijeloxonufu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_4a51f7a5aeb84cf59eba1195eb2fcd59.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_e404c467d1844443b13d03ef9abad5ea.pdf?index=trueIn PDF document text
    • http://xedawobu.atwebpages.com/lesson_plan_in_english_grade_9.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/kudexosarafililirikori.pdfIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_d6da272419be45a9a366653e1c78f7a5.pdf?index=trueIn PDF document text
    • http://dozopedatofol.atwebpages.com/83563872525.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/totifidufofazejawoxogar.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/wixirunanosekixetovi.pdfIn PDF document text
    • http://malejubu.myartsonline.com/86743278923.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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 5276 bytes
SHA-256: 5ec55481a534223e9b573745695efe07ff4de716dc39a1769419f957455da825
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 10532 bytes
SHA-256: 5239e5a384835edd15b045670da603f5811ba60be91716e7e71bae05d4569781

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