Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd40e5f7a96068b…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 06:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4757a729c7801b6da83d843ff2b1a52a SHA-1: 817f98812a1ca1db3b2382e7f75ee5aceeff5a86 SHA-256: 2dd40e5f7a96068b512d078df1270f96cf2c7ff07c09ed7936a861b5cda59cce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The high number of external URLs, many pointing to disposable domains and using UTM parameters, strongly suggests a phishing or link-farming campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=present+progressive+future+exercises PDF link annotation
    • http://ski-experience-japan.com/images/blog/file/takufaweniwebakez.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/bunipewuxovimevufanuzi.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/5895363611.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/33795501241.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/56272565927.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137583525a7f---41163566503.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/99277693023.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/xivebadiwifamiseruwazo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613904cf7a221---sosabejajubebixila.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/tifazafifopepevuzekek.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/tudizaluno.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/99737541201.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/69465500950.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/regafuvujixilogona.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/20342492402.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/20729083061.pdfIn PDF document text
    • http://sfssolution.com/userfiles/file/gidogaxoxan.pdfIn PDF document text
    • http://land89.com/ckupload/files/26099191306.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/bukojoledolovamegixila.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/51077244195.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/fuwavoxulotawapijime.pdfIn PDF document text
    • 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_off0000bfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 10716 bytes
SHA-256: d9ad07a53ec96937063b11d20a12701a22f730691dadb85d5b2d897669440227
font_02_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 17844 bytes
SHA-256: 719d3982e00ae47b1f6143b90a76d0b018ac59101de0affd264b8af81829e80b

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