Malicious PDF — malware analysis report

Static analysis result for SHA-256 844349ce0ddf21d6…

MALICIOUS

PDF

82.7 KB Created: 2021-10-11 05:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d8d3e39d3dc3ccbc6193381dcdc336f4 SHA-1: 4052464d60f68c1e28ef1ba1d40df8c0a6d0a6f8 SHA-256: 844349ce0ddf21d6d8d4c9652b6cd275c8746b6f2209153d4350dea0b4ab8c6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware-hosting sites. The PDF structure and embedded content indicate it's likely used as a lure, possibly related to document processing or data consolidation, to trick users into visiting these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=combine+data+from+multiple+worksheets+into+a+single+worksheet+in+excel PDF link annotation
    • http://grafosaleservice.cz/images/fck_editor/file/gowifofaxa.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/34136433313.pdfIn PDF document text
    • https://olterus.info/contents/files/84392970196.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615ba8670aea1---21812474272.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/51286137169.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/36800182487.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/20948163082.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/59588583705.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/61867457659.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/sepusegefobabupomegebe.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/40159181273.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/72so0qr7hngaed2bciqu4299tp2msum3/35371734986.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/megebimalapuxajupesatima.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/wekipaxevurapita.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/vupefonujifikizi.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/62203120675.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/73954403776.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/34800602336.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/dunegegiwopobip.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1728937777615702d694fc5.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/renotebenejilojosodelowol.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/41964654013.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/24/karezekukopoxewojem.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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 18584 bytes
SHA-256: 77f8ff00b1cdb594aa7c2cbab308bff48780164951017f22e069ec97d817c394
font_01_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 11620 bytes
SHA-256: e62ee1bd822a88324413e2680b68072f6c0030256e8ae9ec18f6874c497f8d43
font_02_sfnt_off0001243e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1