Malicious PDF — malware analysis report

Static analysis result for SHA-256 e809152e1b89b505…

MALICIOUS

PDF

73.6 KB Created: 2021-09-23 06:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 384f77f4d69364abb65db3a5bd75431b SHA-1: d72a4f2f871910e8ba7b6005bf95afa298e719d2 SHA-256: e809152e1b89b505df8b39ce6b0da00fac89e2976ae8a26f12716894a2e93e93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The PDF structure and embedded content suggest it is designed to redirect users to malicious external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mondoaudio.it/img/uploaded/file/79376665586.pdf In PDF document text
    • https://777mto.info/contents/files/dotuzuz.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/zibowozub.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/46603894392.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/najenam.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/35258779772.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109062334398983.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/jaxibuwewegodezewiku.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/dimavoz.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/zetiramobun.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210918_DC3CCD878ABFA9ED.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/vajujebigawe.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/92419314428.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/63656940686.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-13/20210913034504622342.pdfIn PDF document text
    • http://royalgroup.at/tmp/wakemuposikibazazuwaro.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/84214976221.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/15869008712.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/jijowamapabamujevofetaf.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/50597592872.pdfIn PDF document text
    • http://ore-processing.ru/d/files/77709103358.pdfIn PDF document text
    • https://csodamalom.hu/files/files/226916294.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/zasavumak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=india+faug+gamePDF 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_off0000bf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF84 16796 bytes
SHA-256: 6e6680246423ee9acf9565175273e441f858682516633cb855c6114e5d44e622
font_01_sfnt_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 10216 bytes
SHA-256: 0e7fd67851e7caf8471d0411ed4b264d4cc81d93f787d536b167698eb4ab53fb
font_02_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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