Malicious PDF — malware analysis report

Static analysis result for SHA-256 33842c7ffd58f4ed…

MALICIOUS

PDF

88.5 KB Created: 2021-10-07 10:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7ce30b3aa6b820876829c627550417c SHA-1: 1f30028ef273b97a481a80adc81eafcccc78ca91 SHA-256: 33842c7ffd58f4ed1e61053d9982a4907415419e9ed59bc6f58484ef901bb53c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the primary function. While no scripts were extracted, the ML classifier and the nature of the URLs indicate malicious intent, likely to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • 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://rubin2000-distribuitorshop.ro/userfiles/file/65770868485.pdf In PDF document text
    • https://vnmmalta.com/userfiles/file/buvuzuzozufodewa.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/soxones.pdfIn PDF document text
    • http://koala-al.com/d/files/lurijofivuxom.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/xedakademomavenuxabi.pdfIn PDF document text
    • https://makenie.com/upload/files/fojijuwodiledu.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/58204434193.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/zozetakuworekisimokugut.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/dc6608ccd4caa437bbc7f2616a71e38c/72571904936.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/kipimevofuxewigiv.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/libekuzadunem.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/wiresutolatovaperubegu.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/25058379803.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/75suqp9kh42b833m26t95mnroh/saxikoramugol.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/zimosojefajalakozewef.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/batusagi.pdfIn PDF document text
    • http://bluebossa.pl/files/file/bikaxedalabulajega.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/96035244590.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/wageraw.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/voxijavobipozavaxorod.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kipole.pdfIn PDF document text
    • http://dasbluemchen.com/pazatewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=compliments+beginning+with+vPDF 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_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 10760 bytes
SHA-256: 203a4b910c0d3bb7b8178a32733d7948bb9b6ab84f28369f43033a50b60083df
font_01_sfnt_off00010dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 18360 bytes
SHA-256: 40bf80ecf7d239fb8acfc982f74863635283d99f13f5cf2a7b2ddd9b7b4997cb
font_02_sfnt_off00013c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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