Malicious PDF — malware analysis report

Static analysis result for SHA-256 550905bcc26207a2…

MALICIOUS

PDF

70.8 KB Created: 2021-09-15 13:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 896b29ccb576fe0820342f68e859baa0 SHA-1: e52746879135d9cc86bc8aaa0e19c3569f0736ab SHA-256: 550905bcc26207a232343f53f15e50990fd06302cb7a02263a79e6d6809d24fb
106 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on a variety of domains, many of which appear to be disposable or low-reputation. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a link farm designed to distribute malicious content or phish users. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=list+of+challenges+of+global+governance+in+the+21st+century PDF link annotation
    • http://hyundaiokla.com/uploads/files/63474968271.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/xuvibuguvor.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/315072556.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/84706729178.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/17940930310.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/62389796850.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/pajomotojibuz.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210901124856431182.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/98211313801.pdfIn PDF document text
    • http://vhktn.at/images/content/files/73048877068.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pagasasetexivej.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/92267747185.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210905040711_mb4nam.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/bezatul.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/12839766491.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/6495538614.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca1d34b06---tufisazuzokomowedibizevu.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/nejiganik.pdfIn PDF document text
    • http://dmkert.hu/files/file/ronisawugutesedireg.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109070417313530.pdfIn PDF document text
    • http://markaoyun.com/calisma2/files/uploads/zodibaros.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/85582326204.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_off0000b0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B8 16440 bytes
SHA-256: a9bf650bb373360964bca4ff6fc964000fa15d2de3fea7bc07028fbf16424714
font_01_sfnt_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 11164 bytes
SHA-256: c4bc3fa977f353c19d128b9cfc4fb40ee697091d252448b99c142c2023b6060b

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