Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77dc193a04b0186…

MALICIOUS

PDF

88.0 KB Created: 2021-09-15 16:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6dd32e1f1de9d49f0dbff43fad497de SHA-1: de274facf239a28620ec44de23681a20fd3521f5 SHA-256: f77dc193a04b01862eb758bdf976f8254af4ff9dec2c19e8571bd63b3b828573
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 0.9942

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 http://backkwang.com/userData/board/file/zezumozogibifetatuxusuku.pdf In PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/vaboti.pdfIn PDF document text
    • https://onecre.com/images/content/files/67114388412.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/gegerokodinifogaraza.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/xipudasetalipoxa.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/78895785478.pdfIn PDF document text
    • https://motecx.com/images/file/76818466018.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/gizozovikawiviketelaga.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0f66a2589---fatila.pdfIn PDF document text
    • http://besteva.com/upload/files/wolejapawefasamugogobod.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/tebelitomuwowepiz.pdfIn PDF document text
    • https://zagi.hr/files/negifiba.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/58857765846.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/86217277800.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/viresomefebogod.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/40427015653.pdfIn PDF document text
    • https://phukienbep.net/media/files/74778965423.pdfIn PDF document text
    • http://rococosofa.com/files/files/98990210023.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/vubopozadosuwogaka.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/15791611228.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/58901784829.pdfIn PDF document text
    • https://korankertas.com/contents/files/18512009217.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210901_AE50AAAACD220087.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/vuxabedor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kissing+booth+full+movie+watch+online+freePDF 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_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 18284 bytes
SHA-256: 0af3d189b7d44c453288a1379b6ee3b0cde385ba76b183cd0d537ed473bce4e6
font_02_sfnt_off00013830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13830 11164 bytes
SHA-256: f180c14163325da629353aa311d2d786e9d4e1769beb0d31b4005618c1e150ba

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