Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4b801f6bf6753a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 00:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 017fb46433cb1fe66088afe89b677b7c SHA-1: 7aebd92c37fec4024aa76bb9defa714b06832c8b SHA-256: fd4b801f6bf6753a591542c2d387d468752cc925d042e1a1495ccaaa0a17d2c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous unique external URLs, many pointing to disposable domains, further supports a phishing or link-farming attack pattern designed to distribute malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gyn-koe70.de/obrazky/file/36642348628.pdf In PDF document text
    • http://sedaciesupravy.sk/media/file/45869532040.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/59413741008.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/51422612622.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/76630367790.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/giwofinilizafopaxax.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/23769379369.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/dakegizov.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/jaruguji.pdfIn PDF document text
    • http://vodnik48.ru/content/file/63578064018.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/zadosokojola.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/ledoforikime.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210903213221.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/jodowitefu.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/30602674197.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/640410128f5ccc1d1d2c992930859243/31521670984.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/20323460125.pdfIn PDF document text
    • http://sparkpro.lv/content/file/76688883471.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/17806830065.pdfIn PDF document text
    • https://techlan.pl/files/file/86719736209.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/11528312818.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/30942379409.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/ranasodigimov.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/l9uaa3e086bsr1ngdn8iubmjlg/voxogilotezupunujibat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+movie+free+download+appPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/43379225759.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_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 10864 bytes
SHA-256: a25f7a56d47508cc0d63d836e8338021602055d60663b1283c36d6288c64f1b9
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 17884 bytes
SHA-256: a35d63163264e6a6376a53eb95e6fc71615654a944ccd267427693c25aec62d7