Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0438553ee4735df…

MALICIOUS

PDF

74.8 KB Created: 2021-09-25 18:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f7cb8011fdcada3467a7a17d6249d4e SHA-1: fc4ddc043af2b839eccdd1d9856b2cd65225fa8e SHA-256: b0438553ee4735dfb379ecd97ffb13644ce08fe432b15cbd6d3b36a0fd2b797e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=dj+griffiths+introduction+to+quantum+mechanics+pdf PDF link annotation
    • http://epoch-making.jp/js/upload/files/mobumofezo.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/sulufugugulikef.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3770158ccfd6fdf8a631e62e65955743/zasovizinip.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/kolaruvexi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6fd2cc551---tusukiliraxel.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xejizuv.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/6184297636.pdfIn PDF document text
    • http://eichler-kammerer.de/doxosomapatumotusirisokat.pdfIn PDF document text
    • http://simonide.org/userfiles/file/mozutovufimeludaxus.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/82479005625.pdfIn PDF document text
    • https://el-tall.pl/pics/file/56354236662.pdfIn PDF document text
    • http://arucax.am/user_images/file/loraxesunetisusof.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/53823827335.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/32020752426.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/xupikasakuvorenupubuxez.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210909021532.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/17966882881.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/wirabinuxibe.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/2218880895.pdfIn PDF document text
    • https://partetesal.ir/data/file/39906609047.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/gegosuwazuwupusab.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/ketuxebejapanazikawepe.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210908_87DBB0D7EBCB6683.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/duwifawetukejexutixubig.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/90847201207.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_off0000b878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB878 19304 bytes
SHA-256: df6fb78acd50d2d13c5da962f5a863ea9ef90a87fd24f1b71c919d34649ae1c4
font_01_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 11396 bytes
SHA-256: 833a8184df2b61148c9d09559cbe51211ba51f83af9c84e5eb52fd4236567b56