Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4ed7b01ada785a…

MALICIOUS

PDF

67.8 KB Created: 2021-09-19 05:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35912b1d9a7b0a434f5c1728b5ea5312 SHA-1: 83fa5ca58eb8e1707cdca9a44f9a8a636662d18e SHA-256: 6d4ed7b01ada785a939fed74908dde041f79e7f2830c0ec1dedcbcd753b9513c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with a critical heuristic flagging it as a phishing trojan. It contains embedded JavaScript and numerous URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The PDF structure and embedded content suggest it's part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa073c47f4---misovox.pdf In PDF document text
    • http://mzch.pl/userfiles/file/rexebar.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/24296363665.pdfIn PDF document text
    • https://mimpishio.com/contents/files/gegilolibilojom.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/nupopalenoragad.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/lepanovudejajunitetak.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/78863939486.pdfIn PDF document text
    • https://kokomanis.com/contents/files/10077837633.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c63198cfdc---42829566839.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/6408368594.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/talokogatonuvegigojif.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/govagunumefudafuki.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/tidaboburikadi.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/27473471758.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/terexefowekug.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/79953294134.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/goriwabazak.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/53899269140.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/gobosojelaxuxefa.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/falotimufavafizuluvavo.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/19329357176.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/juzozuji.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tukolasotovoxatar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cartoon+banane+ka+appPDF 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_off0000ad8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8E 10204 bytes
SHA-256: d2f01c420b3419c99fc54665feb3572f2234470beffe507f5af95911953e76ae
font_01_sfnt_off0000c45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45A 14928 bytes
SHA-256: fa3dc7e582d2116a14883842255a04221da2dfdfe416e565d125ae8e49905351
font_02_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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