Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a825d1d0ecece43…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 19:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad967bb30572b2f65b0dbcfd70bd30ea SHA-1: b3f12a2c77ebc828406ab1aa7fccb3aebaab1728 SHA-256: 1a825d1d0ecece43c3c526702f5e41306c06325202bea9ca9c38b8f836ed4066
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis revealed it functions as a link farm, embedding a large number of external URIs, many of which are hosted on disposable domains. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=watch+wynonna+earp+season+4+online+free+123movies PDF link annotation
    • http://huucodatlanh.com/userfiles/file/99834020516.pdfIn PDF document text
    • http://blccy.com/userfiles/files/72048486649.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/9535885980.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210908031616.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/f5mau7h805dbstuc5o2dcgjglb/46364370012.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-1/20210901094723193508.pdfIn PDF document text
    • http://halaljones.com/uploads/files/18678888757.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/95948675281.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/36607080731.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/3589881035.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/5607899221.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/xotopuzejolexexavafegipo.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/gufef.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/44814544987.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/maviwejefazogif.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/kirajopefinefazafevunew.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/10b7561122262917007604cfa2480152/79143643598.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/fusasijiv.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/97862562230.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210915211415.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/43400938508.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/naxub.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/42942013815.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_off0000bc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 11428 bytes
SHA-256: a1988649fab4c4984e3d53f9515ae3fa6273df845ad3a402e7f0af960d59639d
font_02_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 17236 bytes
SHA-256: 2730e544c8c66e31fcd156097909920c2202a2810cc7bb4b51543d9b3f77c6e7