Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5d050debcdebf2…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 23:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ff4f6a548b82f76ef6f9f6bed9d6086 SHA-1: b0ea018533adf51907e30d9bf5ed830f81a8f3cd SHA-256: af5d050debcdebf28d401d3bf0c61df754e46157744354147b6d58b53862c5f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicating a link farm likely used for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern of using disposable hosting for multiple links. No scripts were extracted, and the document body was unreadable, but the overall structure and URL distribution strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ce-mi.pl/uploads/userfiles/files/zomesekobuw.pdf In PDF document text
    • http://hoya-system.com/uploads/files/202109151625263360.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/xojofuzezut.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/jovodag.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/97781920122.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2b713094---venakikazotemusuziweke.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67801158360.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca57358a8---bezasulubogapesovojeka.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/41398064234.pdfIn PDF document text
    • https://atiksigorta.com/files/tukumudabejinomomokotugas.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/8003188110.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/wikewofitibugigax.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109072225502288.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/jutovanizubigudud.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/xejorosejutejopasezog.pdfIn PDF document text
    • http://precisao.net/files/files/wajuzuzedoni.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/sinumopevatobotijotojul.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/gakapimenab.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/66276225400.pdfIn PDF document text
    • https://remini.hu/userfiles/file/jimutir.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/zuwenomabuloxusimapugo.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/mixanujululunoteka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=theme+of+if+poemPDF link annotation
    • 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_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 17072 bytes
SHA-256: 09bf866ef5235aab75e1a468ccfe3cb21288db214abea4ccce5fa9ea7e6ed840
font_01_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 9908 bytes
SHA-256: ae8afac50d59b806926a4f9d8af5dfcb8d349428bae1e559364af4b84c660f1a
font_02_sfnt_off000114f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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