Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d88a92f2ac9b562…

MALICIOUS

PDF

78.6 KB Created: 2021-09-09 03:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 016010e2752a9f502fe579367fa696cc SHA-1: fec32216b109c6c581719d5c5fe892857cd6adee SHA-256: 0d88a92f2ac9b5620b3a484f88526af1d399d829f3c0885470c4651d833d47cf
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and numerous external links point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://huntic.ru/uplcv?utm_term=vpn+master+unlimited+old+version PDF link annotation
    • https://avistravel.ro/userfiles/file/79769154401.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/gopomawimamakaxofi.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/52858278376.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/87882612985.pdfIn PDF document text
    • http://18554080.com/userfiles/file/45524822483.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/wubulitedividiwidewe.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/19985161964.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/dudexi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161392a865fba2---vexefexumusubitiseg.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/bojupitiputuguxugura.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/bonoxomela.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/xenisesonazibitesavika.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/44598511519.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/60475576032.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/xopalijoxofat.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/38913526273.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/92431640372.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/68318985458.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/zijuka.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210909064754_xe05g9.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/zokozizumow.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/92182109659.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/tuwigajutatukubolosa.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_off0000cbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 18040 bytes
SHA-256: 3d24c9169f358d53db2db74ab77ad60e2036f47c597d68e96e4d9909bcc381b5
font_02_sfnt_off000112e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 10688 bytes
SHA-256: 6f4d7d7716f673f7404a7c6107137eea98eb5b0214c5532354bfd0c934e463e7

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