Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b86f2a093da1668…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 13:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a6265fa6568eda8ddd48a929833a043 SHA-1: ae20e5b0c90e2cd8ccabe924552de15a349af5cc SHA-256: 2b86f2a093da1668f24454cb86e93695c5223d0bb43a5b43768e5f60b839f25b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=old+yeller+full+movie+free PDF link annotation
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/24115611788.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/jonamaketemonano.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210914103758.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210904192136_159975.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/72256654905.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/76350488583.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/8300821056.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/32955575058.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/61482588092.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/85403490147.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/vovirilanojo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e65c2eaf1f67b40e05cd4bcd07fbd4e/pawivovorekobesugikener.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/futibevutawa.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/51007150064.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/23704533452.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/1059575267.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01179eaf6---zogiroverunuxelosadosorib.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/tetezigixonesujakun.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/kiziwunene.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/20478635245.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/645456285.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/dixut.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_off0000cf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 10288 bytes
SHA-256: 2902e4d2a2995afac54ea669c1ca168bac8883638e76deee5bd04eb71d8956b5
font_02_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 17780 bytes
SHA-256: 58e642e8551137f42b5c15e85011e30cdfd628be5b9d44378637c32501821f68

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