Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a6503ad29f6f24…

MALICIOUS

PDF

73.2 KB Created: 2021-10-02 09:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2430a156318d296564189852d7911ab7 SHA-1: 4af3369742536b9a50bb65302cedd2f1cf1ad521 SHA-256: f0a6503ad29f6f24d7e64e6d354b2be9a58d436bbbf8d215dbf3c0283fce71db
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with several heuristics flagging it as a link farm on disposable hosting and pointing to algorithmically-generated URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thailonghoang.vn/upload/files/rogexadememotejojamunobu.pdf In PDF document text
    • http://gibisch.biz/files/files/19524621069.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/jeriresi.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/90228298342.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/tuvefunixavetikofaw.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/mowob.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/gabunirunulajuzefowu.pdfIn PDF document text
    • http://tvps1.juicy-group.com/editor_upload_image/file/jafinowuvebo.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/wexafezezejuwakotafeboza.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/varumojifepole.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/lolekekepojix.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/nufarikokodomizerowililu.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/xawubokireweduwi.pdfIn PDF document text
    • http://tcihk.com/userfiles/1822141055.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/99843683861.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/kinaranusimefagatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+meaning+of+descendedPDF 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_off0000b68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 18968 bytes
SHA-256: 205ff225d9abd10bd1cb53b4acc7c26bf54ce502819c4b80ff778c76070bf80f
font_01_sfnt_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 10640 bytes
SHA-256: 00e9cc8ccca100740c1ffbf63d3702c71f3a7dcfc28eb11bee8fee59be27b86f
font_02_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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