Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97ef77810bc87ce…

MALICIOUS

PDF

92.4 KB Created: 2021-09-17 23:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e18901e25a1640d2834f86e0af9bab1 SHA-1: 0af9dc3cd39201e3946ab42ce7a0b62095ab307c SHA-256: f97ef77810bc87ce2fe6e116a67ef96e238fa251fe7ffb7a98952b4fa389f32b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous links to potentially malicious PDF files, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ghibms.com/userfiles/files/fapubibagusijipitutew.pdf In PDF document text
    • http://tehnicgaz.eu/files/file/96433417714.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/wilomosikegegasisurinar.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/vesetebixil.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6f41e765---73452300179.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/gedenezufa.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/50117911327.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/34599931737.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/venapajezefibelopal.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/84800436624.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/62303858341.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/tategodepeguputapem.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/66094668392.pdfIn PDF document text
    • https://suksesunited.com/contents/files/10240185187.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/89267847733.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/xadiku.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/37413004402.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/89392570591.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161343b7492ac2---bozanezodar.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/23230467301.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/suxididelovuguzokafumato.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090601481853.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/funopalokuzalifalilofoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+5+installer+apk+download+for+laptopPDF 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_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 10844 bytes
SHA-256: c23783df4103f61ded95416826bbf5d46cb02808e132ba0f1564f82f1fbde141
font_01_sfnt_off00011cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 17924 bytes
SHA-256: 71a2efdb7bb8e3ac7e384b579b98acec34809d9492654f763ed1f6cefa2dbc45
font_02_sfnt_off00014b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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