Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba918361c109af03…

MALICIOUS

PDF

72.5 KB Created: 2021-10-08 15:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 848a3aa840da826feff015b1081ddc93 SHA-1: 59bac31731c8a4533ce7c9d8cc0cc4f2cba934b4 SHA-256: ba918361c109af032c8e3ab8d646893bb76437a354c862d85155317dc6f0579b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is used to link to disposable hosting. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pharmnet.cz/ckfiles/files/files/58670698964.pdf In PDF document text
    • http://likuidart.com/files/ckeditor/files/74580414264.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159ca534a5a3---59730214284.pdfIn PDF document text
    • http://darstin.com/userfiles/files/vezezapejobupitota.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/jefipejuvosupolisoverugiv.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210903_C693CD2AE60A5C2D.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/28479678529.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/29975053021.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/zatibewu.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/dalojewi.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/52666067908.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/49546499919.pdfIn PDF document text
    • http://farashimirooz.com/files/45397364604.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109181349215386.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/26692465185.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/125027a0337e5d05d7979bed6dfbe06f/lelulovajezepezej.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/povizasowedasifafuwoper.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/fokorunabasadagomed.pdfIn PDF document text
    • https://taumed.kz/upload/2021/10files/211003111443847921zv2tw.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/36331155649.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/18628087616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=law+of+excluded+middlePDF 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_off0000b8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FC 10412 bytes
SHA-256: ec25cb939d441546c36202212be8f4669d4dac70512033b7468f0545bb689d6c
font_02_sfnt_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 17176 bytes
SHA-256: 3cc40d6c66630a9c145b232666cfab84ab9260449b9a3e8aadc2d3e035ced2b8

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