Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71af460cc179503…

MALICIOUS

PDF

95.2 KB Created: 2021-09-14 01:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 5bed4b329be950e5d1d25095a50ec81c SHA-1: de6f6aad45150d507ecfa3a7b101a6c44bd02641 SHA-256: c71af460cc179503f710a8e7ac724eee96ee8cecd4b689b8ca5ebea0595f1fe7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://philabc.ru/uplcv?utm_term=windows+movie+maker+for+windows+10+32+bit PDF link annotation
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/28295497048.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-14/20210914063441245508.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25772057879.pdfIn PDF document text
    • https://seikai.jp/free_images/files/gozaxowuven.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109060610213878.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/weritulokarilanofe.pdfIn PDF document text
    • http://www.polni.si/Images/files/sufekakexojenufapezofe.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/12655469883.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/wagitod.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/74146673638.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/95222333791.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/16471661608.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/suxonap.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/funekupofezux.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/nodegin.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/54271697989.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/zamugabewapajebu.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/pigaketa.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/17556303152.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/milekub.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/78091495347.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/7456031293.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/78560869388.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 11312 bytes
SHA-256: fa0173b462f0a78e756ea569675c47b0fcc3bbc44479fb701d9d8aa8a4e0f11a
font_01_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 16692 bytes
SHA-256: d982e7f7cee8a79f2df356d5d5a093ef8245574f0281a7dcb6d5ea68fd1c6f45
font_03_sfnt_off000127c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off0001304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304E 24548 bytes
SHA-256: 7ce191a5df3ab90dce2b88c5b611b01bc55478569f1da8921df903eb136e8702

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