Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e84ae12daeaa50e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 17:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 179b152faa9d3823b921dc4b0d795e76 SHA-1: bd7338355ce7e0f0326dd9a5222b19aae1e8a97d SHA-256: 2e84ae12daeaa50ebfa88c4d0f6783f3c0485f8fe7bf15aaab950e6a428dba45
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm intended to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/fuzijoworake.pdf
    • http://dianacb.cz/userfiles/file/munidagoropaxefa.pdf
    • http://fratellilongoni.com/userfiles/files/lemakexofuza.pdf
    • https://harom.ro/files/file/83953739886.pdf
    • http://orchid-daikanyama.com/userfiles/file/2934983893.pdf
    • https://ceccardolj.ro/userfiles/file/13779464578.pdf
    • https://sunrise-photon.com/upfiles/editor/files/62511924065.pdf
    • http://baldonimarcostudio.eu/userfiles/files/7157903142.pdf
    • http://goldcoil.com/uploadfiles/files/26793377057.pdf
    • https://sokolzgierz.pl/web/uploads/files/27365276520.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3a75bf4b---3734777850.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/dopamodabubiwubere.pdf
    • https://alsharqcc.com/userfiles/files/kugerupuxejemuwekaf.pdf
    • http://cmtl.in/uploads/userfiles/file/file/60605750518.pdf
    • http://eminenceinc.com/userfiles/file/18167349095.pdf
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210908162253.pdf
    • https://accuratesearch.com/userfiles/file/kejitomoxedepuxajiwuxaviz.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325386258ac---fegoge.pdf
    • https://fajanav.com/aym_image/files/90190646765.pdf
    • http://worthingtonpark101.com/userimages/94400016230.pdf
    • https://marcuspietrek.de/MARCUS/files/file/jijotuwoxerodaxufuranisi.pdf
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/vawixoranogowuxurudedozik.pdf
    • http://ibarugi.com/fckeditor/userfiles/file/53257718030.pdf
    • http://thevale.us/userimages/34421872667.pdf
    • https://dcicz.org/userfiles/file/89045563237.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=2020+manual+shift+sports+cars
    • 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_off0000ceaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAA 16792 bytes
font_01_sfnt_off0000e6c1.bin
a342761ff5a79d09e691a44eab34d2ae7cbc5f9e4ebc5701ce3ce9677468d9f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 10860 bytes
font_02_sfnt_off0000ffa5.bin
83e6c686cc804c9cc9e83cf0dfb146e2ef469878b042d5dc21fa6668ad85d7c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 16488 bytes