Malicious PDF — malware analysis report

Static analysis result for SHA-256 d02b9684d773c11b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 05:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8151b212845da4115299eeb71d14ba44 SHA-1: 44e94dbe8825d096b5542ba0727a89056c3ae44b SHA-256: d02b9684d773c11b000794ab7b2188cbd137b11a82e5bbe3990e3f9a97036ad0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or phishing lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the nature of these links, which are likely used to distribute malware or redirect users to fraudulent sites. No scripts were extracted, but the primary attack pattern involves directing users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=fortnite+apk+mac PDF link annotation
    • http://naturestuff.nl/siteimages/file/51398517031.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/4342466864.pdfIn PDF document text
    • https://rafautama.com/uploads/file/87522475751.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/94390748141.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/gezowisadelefu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f53af1ebda---68578785461.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/78550682103.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/tubozidigawolatifixut.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/43709570264.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/dojod.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/16961190742.pdfIn PDF document text
    • https://rajaunited.com/contents/files/54182825081.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/zizuvuxe.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/57667750386.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d8bd65cad---wesunom.pdfIn PDF document text
    • https://people11people.gr/uploads/File/gulujigafapufifaboniravi.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/40213564449.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/10774367264.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/kakenazo.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/rumelavowuxagaralufagaz.pdfIn PDF document text
    • http://devison-matras.com/upload/file/sebawizeveduvuvigugiden.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/63676126019.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_off0000aceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEB 10392 bytes
SHA-256: aa7c6f00aeb11f009a5012650377709e6b6f56ea3b519418d340b7d3b0cf02a5
font_01_sfnt_off0000c463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC463 16908 bytes
SHA-256: 82aeceed9cc09db14d47c9addf08ef3de90c37038cd0140562ddd87591f67996
font_02_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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