Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f412b558500169…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 18:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 474b87ee705e09654fec3387d21f9617 SHA-1: e19343d5d2eebe4217576c8459dc5021945dffea SHA-256: 88f412b5585001697f08f74b545a75d361a87e1bcb20c3dc95d3a5007530d075
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed for SEO manipulation or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://huntic.ru/uplcv?utm_term=photo+border+app+android PDF link annotation
    • http://dierenwinkelindex.nl/images/uploads/17001878039.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/59600048439.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/53318931522.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/xemefewosetelutifa.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/63249205717.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f71b554bd69fabbdd5b099b9c64a06a0/76454354274.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/32728891491.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/wejaberosezabuterinug.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/beferedizekowafepi.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/61712872239.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16149cfbbedc7c---51403674401.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/35705952101.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/zapikobaverenenan.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/xulizifarimujinuv.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/kitevobowevoze.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109261509149523.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/lezudogevokasi.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/57505618978.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/49920304340.pdfIn PDF document text
    • http://bankerz.in/qpic/files/wedudesowabadososasolomev.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/jagobumojusexan.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_off0000ae1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1B 15200 bytes
SHA-256: cd3045aacecbbab156a06b8fa28ffe38acec517dfbb388d81afd99dd000e262d
font_01_sfnt_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 10416 bytes
SHA-256: 0f20ec14054a355e2158ff9c180ad5c55da9ebe69a0480e317a230492f6bf9a9
font_02_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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