Malicious PDF — malware analysis report

Static analysis result for SHA-256 d241027d5d81d3cb…

MALICIOUS

PDF

78.4 KB Created: 2021-09-11 01:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e2b3bb2e56f91da48f7700088806cf0f SHA-1: bb7b47616641834e21f54652fa45ae824203c31d SHA-256: d241027d5d81d3cb7fe5bb6547ac7d565e4ef5ef4d1de2706f6d3b98c32b7f3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it is part of a link farm, likely intended to redirect users to malicious sites. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://institutdesante.org/userfiles/file/32523986133.pdf In PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/fedogenukotuvuguzu.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/figupofakuvaloxusasure.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/89116479460.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/dupej.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/43448275374.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/16521501839.pdfIn PDF document text
    • https://posh.hr/files/52507258493.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/vimoliwile.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/futolupamusir.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/kutasivas.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/saxulo.pdfIn PDF document text
    • http://vejwun.cz/images/minipidexapirogovejokesej.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/fogakisivol.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210907_135049.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/vutuvakokopofolamu.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/98028995343.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/piwopavu.pdfIn PDF document text
    • http://kag.fr/userfiles/file/26236917120.pdfIn PDF document text
    • https://umartravel.com/files/fotivaxovome.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b86119e13---79931055223.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/gubewiruwomeli.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/53851985260.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/78377804850.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/77661072809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tope+alabi+you+are+worthyPDF link annotation
    • http://elezioni2014.gds.it/userfiles/file/vopile.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_off0000cf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF46 17228 bytes
SHA-256: f70f2da9398ca0a72765fa4b4b8fb45e0ff203323de09d8606c62044e0200b10
font_01_sfnt_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 10480 bytes
SHA-256: 6986e3eedc5a6beede84deb9799ae79af2d7c1a0d09a441c415627b55913b275
font_02_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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