Malicious PDF — malware analysis report

Static analysis result for SHA-256 35692d260d574478…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 12:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3798fc876e6adf3ad6787acb3d228f9a SHA-1: 5eccf42ba80fdc9517bfa577f809d8a49b466c49 SHA-256: 35692d260d57447861f850f075d08a21d4caa67b5fb70b6ca42ff511a19f6bdd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed as a link farm, likely to distribute further malicious content or phish for credentials. Although no scripts were directly extracted, the nature of PDF malware often involves embedded JavaScript to facilitate malicious actions, hence T1059.007 is included. The numerous unknown URLs point to potential distribution points for the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://manpukulivermore.com/uploads/files/sisipakaromagibuladeg.pdf In PDF document text
    • https://tsolisp.com/files/file/65986271080.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/75462315317.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/sejuvevixowozupabanuwi.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/80164676233.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/21090612474886481198dsds.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/garebagumo.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/64324458496.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210906010515327.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/83041579433.pdfIn PDF document text
    • http://medi-sen.com/files/files/81674715068.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/mumerawenibolomebi.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/71251687265.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/53563249319.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/74806076118.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/22119598023.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/77685276675.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/7120684424.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/32668977091.pdfIn PDF document text
    • https://beautydent.hu/editor_up/gaziwivom.pdfIn PDF document text
    • http://wjcopy.com/upload/files/74679751226.pdfIn PDF document text
    • http://fteq.ru/files/file/78960327776.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/25675342218.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/kabowubarurozi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/21d6etqfo4la0iv9upfd51aafh/82117749723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=4+elements+androidPDF 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_off0000baa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B8 10392 bytes
SHA-256: 1fcf8764eb1fe9289284acc3cb81aa6a573cd4213c3fc5fb6fc9f63cca0c062c
font_02_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 16060 bytes
SHA-256: aeabceadd8aec4e1dec8b427a16c5fc8bc356ee993d2dbf533d800d2e2913a07

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