Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57cbd22cbb02771…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 04:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06f675c4d20fbe813c2307721b4ec4f1 SHA-1: e599e791ee1df5eb64c9ce076919befc4dc7d929 SHA-256: d57cbd22cbb02771a0969bc42191ee8c30a4f4a9b903fe769647bf3a8405b703
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern, indicating a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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 http://wolfpackbasketballacademy.com/content_docs/rofisuj.pdf In PDF document text
    • https://justforjetscatering.com/userfiles/image/files/xixifefebinose.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/zugobavunufi.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/50383440882.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/vonaremibajuzazawuro.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/wamulawomuzoluwima.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/famapemobakelaxe.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/lizonakizinosofumobapoda.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/wovitasadapawipodimazajuw.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/vabibuvebejebuximowabenop.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/siganipazetonujebu.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/zekuwokam.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa8a2935e---senemefiketewutezedit.pdfIn PDF document text
    • http://etkenkalip.com/files/70821366039.pdfIn PDF document text
    • https://finliz.lt/i/File/24611835592.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/55925369601.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/9777593787.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/kololevaxufitojo.pdfIn PDF document text
    • https://kopari.hu/files/file/31807777478.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/gadonefodofinolugubarud.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/bolunixi.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/bukofatudifogapozomozu.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/91982623970.pdfIn PDF document text
    • http://pneusmarene.it/images/file/lumosesep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=locanto+apk+download+2020PDF 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_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 10392 bytes
SHA-256: 9f81d7f2f1efb0c332bc84bd9c055fd2f3e700a46d6183af91263cbb448f005c
font_01_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 17356 bytes
SHA-256: 2eb8128e4193c4bb92569f32cc3f82d7860ef78c196b8a6d8772625c527a3418
font_02_sfnt_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1