Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf91dabf81ce5e8…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 08:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8b9f89d4f3a53682f2add720190cc5fb SHA-1: 1bc82873382f8bb8e85a66129a34418fe44608b3 SHA-256: daf91dabf81ce5e8bd25b0f4de2f85062dac455dbc66209f3acfd0cfbd7b761a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to host many links on disposable domains, suggesting an attempt to distribute malicious content or phishing pages. While no scripts were explicitly extracted, the nature of the embedded links and the detection results point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alubiasdetolosa.com/files/galeria/files/jelemeravopebuwomonuso.pdf In PDF document text
    • http://megalightgroup.lv/uploads/files/xazigox.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/902db94c56e9a4a41cf868c8a51ec275/5962765565.pdfIn PDF document text
    • http://dgkno.cn/upload/93003936265.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/girufob.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021910344189535.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/jusijemomejepowapok.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/tutemopesukizozunaji.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911202314.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/tedilidizat.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/kawatozirefob.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/29869397021.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/65705187439.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109122228228764.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309f49070dd---47037548410.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/21487220467.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/xareragetoguxoromalus.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-4/20210904031718258208.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/mawiniruvube.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/83415270091.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/bewewaluzefeboxuk.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/vodinasojizizeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+installer+for+pcPDF 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_off0000b6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B5 17104 bytes
SHA-256: 68bdab5cc4b203de486c9a623b0b2c692c3a56c71599841e173ae82ae5fd85dd
font_01_sfnt_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 10596 bytes
SHA-256: 357d514d5bbd70d42b1f5ac928775d1621e768d6f31ac0051ee5fa77b1b96119
font_02_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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