Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64a862230539403…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 05:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6543c7b590f59cf3ece214915684ef53 SHA-1: a803fa9f43f64bfdcbd94881cde7d423af2a0827 SHA-256: e64a86223053940397bd7366fd4e7208cb308bb38b1f4d550511f80b12f4612c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious or disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using such domains. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://transturist.transturist.com/ckeditor/ckfinder/files/files/vosonozibipumezo.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89ecb1c99---rubevazizezodazutu.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/wobazunitemef.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/sinebevitowupiworojib.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/68702377199.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/9755053265.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/gawuwosufefag.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/54844087954.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/mimarevejaxon.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909152539857575.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/xonuti.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/weropusudenamudakil.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/rujezejigebagosed.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/rasilewevi.pdfIn PDF document text
    • http://itena.si/uporabnik/file/gosujikavululugiketelesub.pdfIn PDF document text
    • http://congtyvima.com/images/Download/8367081888.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/timukatokirefojabo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9adc684a---67780177200.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210914143318.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/rujozubatanito.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/06/file/20210906_122437_134.pdfIn PDF document text
    • https://epiphanych.com/images/file/romizixusu.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/96548064557.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/tibapazilonogijokalowet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=punjab+healthcare+commission+act+2010+pdfPDF 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_off0000ae9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9D 15056 bytes
SHA-256: a28bcbb00cd74ef33563c99176f9d6f1242a02d7ec7b8d5b53de6cf4cc9b1c92
font_01_sfnt_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 11552 bytes
SHA-256: a22c2bcc22a8334ec724d831e0deaf9ba0689a725bef8fc2a17ba59f60c18065
font_02_sfnt_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1