Malicious PDF — malware analysis report

Static analysis result for SHA-256 961014ad8e0c7c93…

MALICIOUS

PDF

79.2 KB Created: 2021-11-13 07:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 42d939e63f1aab6e8709c65e6642ec8c SHA-1: f8e7cc18856fa3bd761730711cd3886ac0f0fc54 SHA-256: 961014ad8e0c7c93ed47d1a2681d58d13da6d82a41352b19632e3b0baee79f52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=british+stand+up+comedians PDF link annotation
    • http://hoaphathotel.com/luutru/files/fejer.pdfIn PDF document text
    • http://e-sheremet.com/img/wabulisoganudot.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20211010011703_wej7vm.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/60088348354.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/zazakegexibotadugid.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/83036789027.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/57158150622.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617c9f9e7d89f---93792113178.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/62486161408.pdfIn PDF document text
    • https://centralcms.coodex.net/galeria/files/jemuvomevusubizilex.pdfIn PDF document text
    • https://emenu.hu/editor_up/53211692157.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/sijugewonaf.pdfIn PDF document text
    • http://szpk.hu/_user/file/welapowowubo.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/sewidevukutotamu.pdfIn PDF document text
    • https://priscar.com/documents/files/74438742511.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/vifelekimofabasutixezara.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/tuvovuguwurufulitofinafup.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/40249710333.pdfIn PDF document text
    • http://decorstore.eu/upload/file/dudewolixisigunixujafovi.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/lukovimozadelesajiw.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/fusitugopalopapibadu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wujosusazejoliwazoneduve.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_off0000cc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1B 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 10884 bytes
SHA-256: cff76b653c11f303f3677bd2243dc21433cd770c5c1d8317af52d432a2a4f518
font_02_sfnt_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 19340 bytes
SHA-256: 3c054193f31d0a49e309688ced4fbfff707cdd4fdbd571306e9145cafc4f02c1

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