Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bd76dc30f818d3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-23 01:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4f9fa8a5f967b81ec9694d3a81b574a2 SHA-1: a781c89e760b0fc070c78762621e8d5728b1e2f0 SHA-256: 74bd76dc30f818d3dc50bb2cd9f0ef544fb0fd14a1bee0575a90a792e8303710
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/uplcv?utm_term=free+violin+sheet+music PDF link annotation
    • https://cubic.is/userfiles/file/jofekufuxid.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c11caba75b1ae3986ebc76a47141dd93/55454913162.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/9388083363.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/reluxipefowipijig.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/53952657557.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/rujufamo.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/gadipageku.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/50935192456.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2f7c7857a4dd421a04a187d640149d17/52115219849.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/97556865615.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/rujite.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/batabifubudajezijilofas.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/dedekazebememu.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/68280205277.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/45947263772.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/xogeguwowakajuw.pdfIn PDF document text
    • http://lawngo.net/fckfiles/82385906809.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/51392962570.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_off0000e1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 10476 bytes
SHA-256: 73e502c8a54ad33dbe7fdb5e552642a0eab756b4cedd3923ef77694b1ec734c8
font_02_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 17844 bytes
SHA-256: dcd0dacf9051d858639bea917b71502fc86902b7266aa30d5178474789052ac6

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