Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a012e9229931684…

MALICIOUS

PDF

82.3 KB Created: 2021-09-24 08:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ab006403b94a4135df167fea6ca5e52 SHA-1: 43be1fecd06ff3af797faf74a1586d4485278d19 SHA-256: 8a012e9229931684323634c96c5b18a85f2b3d30793546a3412be512825bd635
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. It also leverages numerous external URLs hosted on disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further payloads or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=head+first+design+patterns+pdf+download PDF link annotation
    • https://itscebu.com/upload/file/20210922001018.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/36519037525.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/zemenobapojufagetifan.pdfIn PDF document text
    • https://ever-progress.com/upload/files/43250358442.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/t944bq75o5g5aceinlsujkuste/36866192223.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/74781255000.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/53013475267.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/71970695219.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/1286368591.pdfIn PDF document text
    • http://northcity.rs/slike/files/vamukevofamedoj.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/bageladamujexivixovumepig.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/gaxojidezateleladikolezu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/fdc4fc5fdc89cba4714e660d6b4b3f6f/labanepiru.pdfIn PDF document text
    • https://vientangluc.com/upload/files/14324848446.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/22721456830.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/nuwuzepodemevugev.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/mewugebijewutegofufu.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/13225684002.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/zurawukaruvodet.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/dabogovufanesabejoludexem.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/ximebuporud.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/mipimuwoxovom.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/pawazarabujazomigenoferu.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/dejasivar.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/mewetupikusifufebejam.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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 10748 bytes
SHA-256: 952b0c7d4f5af79bf5a9666b3dd1416bd1d8f19d3f630e07deb378e46ddd0f82
font_01_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B55 18840 bytes
SHA-256: e1c5a995c4b5e2ab9cb176256785e56e9883a238711c9b09f4f9c502626323b8