Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0628729720ee97e…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 08:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ed682b4b9c9bd334685e4f82069a8d78 SHA-1: ffe3faa536e01972f10519c0aaf88d7449267037 SHA-256: b0628729720ee97e20b28b81a142618b49fae30f345163c488de5d41ae3a3467
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or engaging in phishing. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=mobile+tracker+download+apk PDF link annotation
    • http://anhbanglaw.com/userfiles/file/tatetofibalosojugam.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/1466123697.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/41964202817.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/27914735529.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/tobidoruwexuxugufuna.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/sorevo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161500cd1d8bae---vipapudikevepexejulaxuxis.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210910_4BDB1962CE2A76CB.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/50259490241.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/litopavizutilidupewo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/vunokagiziralam.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/fenupizinipumefapuserez.pdfIn PDF document text
    • https://bawauang.com/contents/files/sojitov.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/dotigosegabofevud.pdfIn PDF document text
    • http://topp.pl/_topp/file/lowijegusaxonosekoze.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/geravukizoniza.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/84730708849.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384288b4caa---22639524361.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/35740019934.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/52568652444.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/kodefibil.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/leduniterujigo.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/17057202310.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_off0000b2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CA 16208 bytes
SHA-256: 876e5cfa9cb7461c7e25da5c5e2195be6e57ea2e4fd81717c4847c9f7e657957
font_01_sfnt_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 10648 bytes
SHA-256: 2557f8f69c326d1afc0a620055e4b1f0a1a49c67f39d4bbe015978bc49e23780

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