Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d768646316e3c73…

MALICIOUS

PDF

70.8 KB Created: 2021-09-12 07:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87cee4f9d7c78a6a66be3b3264a8f3d4 SHA-1: 1b5784afde6606787f6a026a46cbdfa4c10cac4e SHA-256: 4d768646316e3c73808bbc43dba33f03626aec761c9894152ddde70fd7d9170b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. ClamAV and ML classifiers strongly indicate maliciousness, specifically identifying it as a phishing trojan. The presence of external URIs and the nature of the heuristics suggest the PDF's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://muzeumostrowiec.pl/obrazy/file/67769040390.pdf In PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/051014292297.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134480d08345---puluwiwolotutebivab.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/goronemesazojexogumelu.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/gusoreledi.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/loginelafir.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/25388298241.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/duwikukojuminug.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/mapejilinab.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/83596554725.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///16072449811.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/66956576290.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/tudaguwifejovujupo.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/95343848588.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/gowif.pdfIn PDF document text
    • https://polaria.cz/images/file/taxafoxexokofarajesusowo.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/98488106276.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/magumekenugoxigumavokod.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/39257540085.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/zetovavirovikebo.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/vagerite.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/bomaxavatexomogum.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/waxezinano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=scribblenauts+remix+apk+free+downloadPDF 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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 16924 bytes
SHA-256: ebd01e5ab09e826feea1bd8dc1171a357d58cf4559da6111720d87d9e3801ba7
font_01_sfnt_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 11376 bytes
SHA-256: 0096b890637570ba963949b4c0a9079b9cb1002ff0fc48c2b3c26a425fba0503
font_02_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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