Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8af6cad3c3d5aa…

MALICIOUS

PDF

67.2 KB Created: 2021-09-30 20:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 062e3c9354e044fe1bb8c67231472642 SHA-1: f0342f50399925bc30d14bcd220528278e052227 SHA-256: 3b8af6cad3c3d5aa8458a92f7f0fd4edeaa6538fd76d118d57b6c429669e0973
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, many on disposable domains, which is a common tactic for phishing or distributing further malware. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://viettrungson.com/media/Files/84008521802.pdf In PDF document text
    • http://navigator-nsk.ru/userfiles/file/tutavigapejij.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/26abd945b7c87484da4e1baff94d158c/wesurib.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/mokol.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/25664555470.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/notopinutiza.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/46271977677.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/narorida.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/46157645242.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/finili.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/lowofozamovet.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/4821647315.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/861889251.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/gudosokiguw.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/sovefofomelodasab.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/vibanudebeke.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/57512895571.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/basexafakinosapi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140201632ad6---27486338565.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/sapafezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hyper+plinko+appPDF 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_off0000aa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA6A 15172 bytes
SHA-256: 488442485ddbd359702cc4958955a3552320de6ee41d06fc72399c6a375cbdf1
font_01_sfnt_off0000d131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 10176 bytes
SHA-256: 6d8e2b360450ce01027e0767f891c8df2e74329b1da8430e45fdea1293af14a6

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