Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5eea0958ef4c295…

MALICIOUS

PDF

72.3 KB Created: 2021-09-17 02:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e3a6f0cf31d092bb7b9fcc1b3ff431cf SHA-1: b4f834cc9473efc81fd32f4f36c74ffda44dfe0e SHA-256: b5eea0958ef4c2955482b37658f2a27354af90ec658571265f6196d0076f973c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains a large number of embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous external links indicates an attempt to lead the user to a compromised or malicious site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=minna+no+nihongo+pdf+free PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d21d09ddb3---titojogapise.pdfIn PDF document text
    • http://suurelepa.ee/data/file/kovaxigigemogono.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/78724487180.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/76998426149.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/maxibisifarawetivanutaf.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/jifefifubaluwolofanisi.pdfIn PDF document text
    • http://badgerhillfarm.uk/93571294513.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/xekulumoxuloxeto.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/8909368291.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/28060695859.pdfIn PDF document text
    • http://juncheng.tw/upload/files/11454907657.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wetoduruxosaragufigivakik.pdfIn PDF document text
    • https://zzhqhi.com/d/files/jowobixol.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/24879787755.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/mejodeno.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/48415669968.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/zidusunepigufuwisig.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/22832171349.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/24715052542.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e9b3c42cbc2bb52775b10e092be0e31e/37259960160.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/16673309005.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/917365669.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/tikezonem.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/falazipunemefidap.pdfIn PDF document text
    • http://webs123.com/userfiles/file/pagenoniw.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_off0000ba2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2A 10460 bytes
SHA-256: 27b73695cd3948446526357e18ffa7a89c5c0913d31c9850038998c5c99de972
font_01_sfnt_off0000d190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 16008 bytes
SHA-256: 9902ef7597f724fb4acc94be27b250548e09ce67fdb5a34fc946ba7db0e496cd