Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda6b4bdf98bd1e1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 16:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ae21e67d2f5fd22ac705da0ebd1f4d9 SHA-1: 36f7cb93210e7bce49e2f185c2eaee64601f5b7c SHA-256: eda6b4bdf98bd1e18bd0ddae670471725aaa88f172d5752cfdf438722b02eac7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, though obfuscated, are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sovaimm.it/userfiles/files/44109743118.pdf In PDF document text
    • http://zaiger.ru/img/file/55575739488.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/dezabuve.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/wizuwik.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/41137453351.pdfIn PDF document text
    • https://tckontrola.hr/files/66072985853.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/35228140208.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/4757547922.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/71433237259.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210919_121116.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/86085237716.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/73323850500.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/47120177827.pdfIn PDF document text
    • http://petrduchek.com/files/74476923916.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/nabizikulakulu.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/69828015678.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/54966816517.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210907_F4E03D9A0577CDF5.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1d3d1d284d749fdc8a346d2dcb209cf2/jemuwimevabibiraropumup.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/13412003233.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/67837677520.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/pufeziwufumetivimap.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/28028295858.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136253da6399---10572890447.pdfIn PDF document text
    • https://atlantidegattico.it/file/fafizagupagomagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=watch+movie+fifty+shades+freedPDF 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_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 17328 bytes
SHA-256: a86c62f82586e95129275aad6941ce1eef70b4bfc4ef1fb3c43f3be94fe81bb0
font_01_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 10764 bytes
SHA-256: 68a9a46ebc3e50e74f91b0e313d7f9dcc8e763ff29abafafd8c68e2ba75980bb

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