Malicious PDF — malware analysis report

Static analysis result for SHA-256 a897aac9550f7c86…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 14:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b5f69ae1073b5e5ee895fba642fa2b07 SHA-1: a849fe661b733dfda9b3fc6668d9fae17b4f1c85 SHA-256: a897aac9550f7c864bd69b7f501aae4059b4b71316bc2e44632e8cd24aa75d73
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are flagged as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ranch.pl/files/file/65642481552.pdf In PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/zatodin.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/nedalirepegidetofazefem.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/10546219456.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/13940703352.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/38618900512.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/37275870913.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614533a36a2f6---20912980535.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/noxupam.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/42565195794.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/wodovupazijodesuzojijaxow.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/62930511844.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210917_6AF81E190B7C7DA7.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa52607b4d---mavuzogimabanifuw.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/movomi.pdfIn PDF document text
    • http://electric-kernbichler.at/81785433230.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/tudexumo.pdfIn PDF document text
    • http://taociren.com/upload/file/210910181457695376p02yv1d7i9rv.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/kexejajavurumaba.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/lawemimomuse.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/dimowuziwulorokobi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/felaxozuzunax.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/2808273331.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/jebexexixewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+sites+to+download+anime+moviesPDF 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_off0000b9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D8 16996 bytes
SHA-256: 8cd6b8f2b592a11a479553ab3684dd7332a7a841471db77929654104018b3e67
font_01_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 10512 bytes
SHA-256: d2b2c73da12afe8230224ecd65080bc67af73344dc04a7d85dfbd0d93881fd96