Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3af5cdf62d5830…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 18:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d67c2e159ea9e6aae7670d17f1f120f SHA-1: feb2d21f94c841f576c4fe6db871439fe89ada56 SHA-256: df3af5cdf62d58307b29b92071f7fa39170fd54935d87a4c15194f49654f1b4b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dogathermalhotel.com/resimler/files/javazipadofodumavurukime.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319272f394d---mavapuxexu.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/19267942938.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/48035994420.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/sitajijenogosodusefo.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/24585169745.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/8493110783.pdfIn PDF document text
    • https://blugarden.eu/file/49329948817.pdfIn PDF document text
    • http://carbonelite.ru/file/fajeduluv.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a6101dac2200b84e3477a35eb889f69c/jepul.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/22406556474.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/36390751788.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tixubebuno.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/kitufexusuforejikaf.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/gotogulowenu.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/26446762117.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/vaxebijasuxina.pdfIn PDF document text
    • https://samowar.me/upload/file/94622048170.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/79365634621.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/58800313828.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/64078458386.pdfIn PDF document text
    • https://sitarasign.ir/data/file/vakogeruravuzolipojab.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/liboxolumemejiboku.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/34170005165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=paint+color+mod+apkPDF 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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 18092 bytes
SHA-256: b62ac8e25cc55df965b1d673bc820ef006ef20e0d3871425aa3ddca4c41ba228
font_01_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 10468 bytes
SHA-256: 8de0e527e150337428078b8983d1e7490de476547e8b68f31618c016e5509ef0

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