Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc01d102c041434…

MALICIOUS

PDF

86.0 KB Created: 2021-09-23 12:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8239321f3f69592451c06fee26f25df1 SHA-1: 74b75f3177e44ecaaf14075cc89fffae3197a1ea SHA-256: ffc01d102c041434133fdcaf17a3820612116be5b7dc6f48671a8b770ec4fcb9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to potentially disposable domains, suggests a phishing or malware distribution scheme. The embedded JavaScript is likely used to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://chetanaus.org/bheru/uploadfiles/file/kisuxovixagiz.pdf
    • https://jobtiara.com/files/files/92451180504.pdf
    • http://technoauto.jp/js/upload/files/kinorabemizuxufexav.pdf
    • http://ihdbd.org/upload/files/86085801059.pdf
    • http://rtm-plus.ru/ckfinder/userfiles/files/lusuwemofa.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/60507094596.pdf
    • https://eksiliotomotiv.com/upload/ckfinder/files/42155826079.pdf
    • https://888nv.ru/userfiles/file/kelub.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ade3750c8459e2c90e55721154af1859/javonivovele.pdf
    • http://akvari-um.ru/userfiles/file/71445361680.pdf
    • http://grupopiscis.com/upload/files/63802466944.pdf
    • http://marketypik.pl/zdjecia/fck/file/71399090056.pdf
    • https://k-newsletter.com/ckupload/files/26659955934.pdf
    • http://tarnava.eu/user_images/file/gojuferipovumoledudopuv.pdf
    • http://hibertek.com/image/files/20210913_225421.pdf
    • http://erulingua.hu/uploads/content_files/files/18707056612.pdf
    • http://studiotecnicomartani.eu/userfiles/files/93535057291.pdf
    • http://solar-makernavi.com/ckfinder/userfiles/files/1015640313.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/hfhvfr8a6ognrtpcckb7s5sv8f/54501675053.pdf
    • http://kedehg.com/ckfinder/userfiles/files/55141486025.pdf
    • http://danangsculpture.com/uploads/image/files/32769382462.pdf
    • http://thegioimaychaybo.com/app/webroot/uploads/files/nuvejajekar.pdf
    • https://taiwan-tiaya.com/upload/tiaya_official/files/gasesoso.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+beauty+of+the+darkness
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81e.bin
96bc393e7d90370e285542a3eebb7cae3e6f96e027014befac06e913bb8ce4d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 18516 bytes
font_01_sfnt_off000117ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 16792 bytes
font_02_sfnt_off00013003.bin
6858ddb8e71fff7f3e3239b76f9224a368f1e4ededda708aaa8a2c6994c74b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 10720 bytes

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