Malicious PDF — malware analysis report

Static analysis result for SHA-256 08461f45cfb2820b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 08:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9ee0e96a916d47edce77c82268f7d55a SHA-1: 441010db46a996b9e3583ccf540af7cad2b0c119 SHA-256: 08461f45cfb2820bd009ecec6158c3aa65a27c2e82d2e2008fca67419f3929e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous embedded URLs pointing to a link farm, which in turn hosts more PDFs, indicating a multi-stage distribution or phishing scheme. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://codienlanhtrangia.com/Images_upload/files/liwoj.pdf In PDF document text
    • https://srilangkapools.com/contents/files/46285641358.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/78598696404.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/viguzonito.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/daborugukizokuxugamel.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/kejunak.pdfIn PDF document text
    • http://budka39.ru/files/nepupiwodatewuv.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/57524950548.pdfIn PDF document text
    • http://pileki.com/imgup/file/84211380662.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/38893523127.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8200dd4d1b87b4309be4b2f8fbd5332e/gunuz.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/mezesijijivonasaburuzum.pdfIn PDF document text
    • http://healthywithhart.com/res/file/tumutape.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/67762038751.pdfIn PDF document text
    • http://specialcats.nl/media/files/786268212.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/40880974017.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/kowidanipiwum.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/88214208904.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16145ee4e8043a---keruperipoba.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/xenujezik.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/56967628518.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/nasiwenumagofan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=convert+video+to+mp3+audio+onlinePDF 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_off0000afd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD0 14496 bytes
SHA-256: 3859fe17770f1d58b5734f62949ff6156598b5e027c5032d38314e56dbc6c4ce
font_01_sfnt_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 10752 bytes
SHA-256: d4ba7249cc21dcb854e10569000612d4d579bb024d1a921c2502d069dd7b5731

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