Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b3d174f224e5e1…

MALICIOUS

PDF

49.4 KB Created: 2020-11-07 09:20:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4e723dee94e6ecad0618c3a3a7d84db6 SHA-1: 2a4f06b007c3bff3edbe106b2f08ff9edff083d0 SHA-256: a6b3d174f224e5e16ecf132ed6bd1cc23b1a9ad3532e0ab096c0d007b0a0ec3b
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to potentially harmful content or facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/wb?keyword=graph%20y%202%20sec%20x PDF link annotation
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/ximajutufis.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/9b53ec72f.pdfIn PDF document text
    • https://lovunekigip.weebly.com/uploads/1/3/4/6/134685916/48e8748855026.pdfIn PDF document text
    • https://fosogaji.weebly.com/uploads/1/3/1/4/131455903/zudibatikoresofopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7213b07d-f801-4452-b4e8-0f9cff36116f/game_hacker_3.1_0_apkhere.pdfIn PDF document text
    • https://niragadofob.files.wordpress.com/2020/11/31700805951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c216e3-1dbb-4431-a08c-9fdfc75d11f8/97114018389.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdfIn PDF document text
    • https://safopidupi.files.wordpress.com/2020/11/90510861204.pdfIn PDF document text
    • https://vumakatove.files.wordpress.com/2020/11/dragon_naturallyspeaking_12_serial_number.pdfIn PDF document text
    • https://ranalofegi.files.wordpress.com/2020/11/devavulidekes.pdfIn PDF document text
    • https://dunefufurux.files.wordpress.com/2020/11/google_sheets_run_script_on_checkbox.pdfIn PDF document text
    • https://simofed.files.wordpress.com/2020/11/99926946745.pdfIn PDF document text
    • https://jalekep.files.wordpress.com/2020/11/18491050671.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://scripts.sil.org/OFLIn 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_off00006532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6532 5320 bytes
SHA-256: ab71e4202b9dfdfa8021fc850d6fee09e8ee016ae70bf2aaf5aaf3291d642614
font_01_sfnt_off00007758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7758 13628 bytes
SHA-256: 84969ed07809070fe7040b89386f4e5772fe205ede703e013ea89d63598809ca
font_02_sfnt_off0000a3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3BA 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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