Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a2a6c5442b2ef6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 15:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3300562c0ac8fc2ae33b1b1849834b78 SHA-1: 5536391c914101b4adc6e73727ec69287a808af7 SHA-256: 34a2a6c5442b2ef6e0d5ce138c37a188d800bb90b25d26f55729f8238977b096
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kq9f90ionud2eu76eoj1jf1f52/doxagodokijok.pdf In PDF document text
    • https://deesudcoolingtower.com/userfiles/file/86413176910.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210903081242.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/88979997677.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/tunabuluxoxagawibo.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/49967238596.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/vatelujobogetibu.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/motelawunifowofulemebilu.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210906095841.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/besepaz.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/76544180948.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/48096559234.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/44965432415.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/vovanakisumo.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/84381411948.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fatuwaju.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58309558412.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/92302316598.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210918072234_au2207.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132273017ff1---bumupelusoz.pdfIn PDF document text
    • http://analhospital.net/file/files/wavigarizifuxudek.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/92237529581.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/28626429081.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/63773543103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=illustrated+kama+sutra+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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 17492 bytes
SHA-256: 85f208e20e2827affdd3f37733cad1d0264f25e33e2f7e9b759e2dd489e064bc
font_02_sfnt_off00012335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 10484 bytes
SHA-256: f8450b59ca72fa6ce7108898d6a2faf402669526d6693314fe69afcd08ee8a0f