Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92b9a7fe636b205…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 09:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c39c47fcabd607199842ea0a93f3eb61 SHA-1: c4d69afe905694f37840fdbab858fba04299caa5 SHA-256: e92b9a7fe636b205da96b4c8239d849b9d29b79e50182064b6a764a305655d71
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains a large number of embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://boucherienabli.com/uploads/FCK_files/file/moliradusaragakivodunusik.pdf In PDF document text
    • http://remobudostol.pl/pliki/3109950867.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/ligezukux.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/sufamejap.pdfIn PDF document text
    • https://bliznacite.com/files/zoxexodutenipiz.pdfIn PDF document text
    • https://andhimazhai.com/images/files/sinam.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/89959310046.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/poxazivuretajezog.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/raxiza.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/64558641433.pdfIn PDF document text
    • https://eventaipei.com/upload/files/10399485163.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/kixugosiviwetolapo.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210909_030917.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/23008365321.pdfIn PDF document text
    • http://i-dron.cz/data/file/dolilufinonufim.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/59188270034.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/86236323407.pdfIn PDF document text
    • http://almuhja.com/ckfinder/userfiles/files/ridiwokonalafojesubifep.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/30305528877.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/76304138961.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/tonopuze.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/zixovumoxuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=watch+murder+on+middle+beach+free+onlinePDF 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_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 17220 bytes
SHA-256: 5a123c845fd4a9bf81fd46f6a04c73d4abf5191eaaa8648041d791e7cb3cf3c2
font_01_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 10808 bytes
SHA-256: 98f4bcd540b0cf97016227115118a70f39e6576d2a85651d2d676b41e43bb85e
font_02_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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