Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d09a41863fafdff…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 11:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acd8c181f48d74b51f5c2957f67e73e4 SHA-1: 7a131fb75ee31e5a5784e7988685a05bccb5c68e SHA-256: 9d09a41863fafdfff03078d89b6fc84ba334f32b9f479440164058acee49561f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were extracted, the presence of many external URIs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=text+comparison+notepad%2B%2B
    • http://zamokugrofa.sk/admin/fckeditor/file/pajulorobowibowopebe.pdf
    • https://wonkingchina.com/d/files/22746883461.pdf
    • http://hujiangsy.com/upload/files/7940119164.pdf
    • http://cdkkck.com/uploadfile/file/20210908032254.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5f71d402---wenefomavitemok.pdf
    • https://parlagame.com/calisma2/files/uploads/pukisawiz.pdf
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/49851777056.pdf
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/22757676518.pdf
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/53122433445.pdf
    • http://geobigoni.it/userfiles/files/xomiwiweve.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/402baba80e485f4694614cc200d02b12/75978959793.pdf
    • https://careerroots.net/ckfinder/userfiles/files/lebakakigiwopejivorusuva.pdf
    • http://steffis-strassladen.de/userfiles/file/vaminemezu.pdf
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/76674167614.pdf
    • https://noventa.cz/media/files/file/rorinexenatafugu.pdf
    • https://equinox-e.com/upload/UserFiles/file/besalupopelikekurusa.pdf
    • https://francemonde.news/UserFiles/file/giwolun.pdf
    • http://www.ufolep-69.com/contenus/files/18095729377.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/veleturiwaxuv.pdf
    • http://naylorrealty.com/userfiles/file/15960107702.pdf
    • http://hrudolf.com/userfiles/70446855329.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/68327246249.pdf
    • https://yilmazlift.com/userfiles/file/rawoxagidisilopewuf.pdf
    • http://eyela.kr/uploadfile/fckeditor/file/sarabowupan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b127.bin
dbe9601b0b7205b4d5fcc0ef8bf0a0a64888bd375f0cd52040e4a047ab40a30d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB127 10696 bytes
font_01_sfnt_off0000c9b4.bin
80db7f00ed63ff34c1dcd99dfa8dbaae2425ae3eca34d8671f9d6804ed2ff351		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 16332 bytes
font_02_sfnt_off0000f371.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 16792 bytes

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