Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa8bc619796d1c2…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 20:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: bec235cc23615565cc1d2a94af0242b2 SHA-1: be72f97bdebd101457a85ea7be2c942b15e75a41 SHA-256: ffa8bc619796d1c2382d09446c13ee83b0da2bc49fd99f55d34930b1dfd18ccc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=globalization+a+very+short+introduction+5th+edition+pdf PDF link annotation
    • https://irantruck.ir/data/file/xulemafefijuwadugimeru.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109042020159905.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/34005239074.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/40297315315.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/39071614433.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/65590266787.pdfIn PDF document text
    • http://belovosushi.ru/files/tididorabozoma.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/wejufageretawolenus.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/11900220859.pdfIn PDF document text
    • https://ratosatu.com/contents/files/pedufuxopodalaf.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/43267893872.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/zuborotadorumu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311df1dcb27---xoloxikijelilogonogeje.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/fezudun.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/zipalewiwudaxibodif.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/gekewitofunekupenudogav.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/41432636478.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/segikid.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e8a1a4ab---wurigajuvavev.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/97355592942.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/22117839854.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/48716316318.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_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 20596 bytes
SHA-256: d37402dbaefc1d7cdb30ef726291a8811323788e5c7c37a416030291c7ab15bd
font_02_sfnt_off00012af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF0 11368 bytes
SHA-256: e21f82fcfe5ed3b9439bcb2c072395a412de46212036b1b4e60e29c7d461da7b

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