Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43324ca72b58640…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 10:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4039e66ed59bc7c16186f42a3e15362 SHA-1: de82cefb773660a08be2de1118b12be7670ee71d SHA-256: c43324ca72b5864027c1bf96dd3755fc6f7fe15591dcff4be500c31691ca9610
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fgcrubochi.com.ng/ckfinder/userfiles/files/1102634211.pdf In PDF document text
    • https://www.ruchya.com.tw/upload/files/45723039350.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/rebeweruxafekoxozid.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12cf30cfc---mibafepafewofeg.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/27422994648.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/fabadapebasagirivomataf.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/50274551415.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/kolubusiporetapap.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/ganadidewozuwawu.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/tatofamuji.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/lezokib.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rng4kjj9pu5b2tiu86svm9jrme/fosuzuzarefasosekowu.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/15307437139.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/20996710189.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/koderatefexuf.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/segixepofepeb.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/palukozosidawibureliba.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/pufewuvoveratikawuzadevo.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/dozejakebojopawexitorife.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/muvaw.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/zunubikijesukep.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/nikovagonabelopuzalarovil.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/78140325200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cara+memperbaiki+android+yang+rusakPDF link annotation
    • 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_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 16640 bytes
SHA-256: fae9fde41387812c565337e9a1465046b65b326c1856712b1a4f4e09058a40ac
font_01_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 11068 bytes
SHA-256: 60469e80d5a054ea9ecd9e8b205b29316aa8802c08385f0fc5f78e9eabedb9d3
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1