Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df241659da03e9b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 14:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d93a737a35c57afa350038a8f15bd62 SHA-1: a01520c9ae1af7d8c71ba773a111ff199a409223 SHA-256: 9df241659da03e9b90e6ff74499816a55b94516b8766d17c96c095048376a20e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests it's designed to lead users to potentially harmful content or further stages of an attack. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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://laborke.ru/uplcv?utm_term=handbook+of+algorithms+and+data+structures+pdf PDF link annotation
    • http://sithome.com/upfiles/file/20210901115347.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/94777822168.pdfIn PDF document text
    • https://suksesunited.com/contents/files/60759875140.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/vabogoziramabalopibem.pdfIn PDF document text
    • http://tianfonmm.com/d/files/68893904635.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fafukeji.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/1152302380.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210906101338.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/74125580915.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/68420481090.pdfIn PDF document text
    • https://training-access.com/upload/file/ruzasapaleraxatoruvagax.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/vuwekotis.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631507620.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/vimovanutefivazeda.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210918201518.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/lijajadisavineru.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210914/file/rimezuvumetadotilik.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f363b7b09b---gemiguvalowuwozolul.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/bavomupidevufow.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wikigunovobusobakezonitem.pdfIn PDF document text
    • http://stagticket.com/fck_upload/file/25031317121.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_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 11392 bytes
SHA-256: 597aa1686efa1272b6520dab3e2b3a3b2cba9c1e264116ec0a12b090fdffb6ef
font_01_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 17900 bytes
SHA-256: af2de21f7b64b0b7ab262ff8f2a16e845e0805d039ffbcfe1c8457f4f781f390
font_02_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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