Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb61d3814617ca8…

MALICIOUS

PDF

91.8 KB Created: 2021-09-11 02:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e5ecee04a43b87bcf32f4bbb9c8d2c84 SHA-1: 225669a3958dd367191e7ca8017c53a653b721df SHA-256: 9cb61d3814617ca83119f9145977032c8f1d7a63b49a319a405dfbc648db66a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm or redirection scheme. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating an attempt to manipulate search engine results or distribute malicious content through numerous links. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://noithatsah.com/webroot/img/files/10065388166.pdf In PDF document text
    • http://uelzecht.lu/userfiles/files/jonamaketemonano.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/tenapulaboreriwova.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/11415279077.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/30023054722.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/fusideketawoperox.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/toruniwomoku.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/xotesebexaviku.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/wepekunixepuvenan.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/lovezif.pdfIn PDF document text
    • http://lyshiying.com/d/files/13085076028.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1f67c325---zelepekuv.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/96121990351.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/bozapuzakagoradafoluf.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/manuma.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/81914751984.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/2968064281.pdfIn PDF document text
    • https://bselink.com/userfiles/file/13420934046.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/sevojofamavazoraro.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/bogikuzifazojemavufofujip.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/noduzedodabavasijabida.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/40194769623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=avengers+endgame+full+movie+apk+downloadPDF 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_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 11068 bytes
SHA-256: 0cdf61e676801ce695e4b6af963a30a0f474f1f65c99b74908d0f94d26059e80
font_02_sfnt_off00012aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 20752 bytes
SHA-256: 8333f8c46c62a7cf89e39091786e11eafcb574115f858063714577f075f9d310

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