Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd6d51afab2fb14…

MALICIOUS

PDF

74.7 KB Created: 2021-09-29 10:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8d4908771b4c8fee5a0d664cb8980505 SHA-1: 1fe82e5c8b1d8d2a863b2ebee5b4231729f0e99f SHA-256: dfd6d51afab2fb14c2a9736304791b8e6c063e43c0cde6abef934acc720c65d9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of link farms used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=vidur+niti+pdf+gujarati PDF link annotation
    • https://volandovia.it/public/fileeditor/file/19589612040.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/51711923487.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/96961850044.pdfIn PDF document text
    • https://music-group-store.com/upload/files/rivelepotomogemo.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/26765533593.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/mukamaropavulofos.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613caec6b16e1---99731501244.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/45662932245.pdfIn PDF document text
    • http://thekkadyinfo.com/userfiles/file/kidoxugifofogimomopulur.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/66293467804.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/zenobilumoxirasegusubuni.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/55098104214.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/dapapenufakuvuzono.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/37507489506.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/vibasizesemezavagibisega.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/15913297929.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/54556260896.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210911191424.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/65974669624.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/1563050976.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150857459672---vutupuzanupozirakiminifel.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210923_045634.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/gufigunugeritusoseru.pdfIn PDF document text
    • http://domario.ru/userfiles/file/22882813456.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/47229189057.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_off0000bc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC74 10408 bytes
SHA-256: 86ec583aaf9b43acf37c8285e27868b2b59c24b588e6fd7308db5df39c733337
font_01_sfnt_off0000d3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DB 18896 bytes
SHA-256: 4465aad277401f192989ddcc8ce5ad786a1e53ff459e4d09233148a99f913796
font_02_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1