Malicious PDF — malware analysis report

Static analysis result for SHA-256 20601f500b9573ea…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 17:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64fcac240616b67d0f1572aea2913030 SHA-1: 77c52e656acefd2241b92725be0938a221f529e4 SHA-256: 20601f500b9573ea71972a4f8515eacb164005d4ddf229a004f5fe3c4c47041d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to host malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the final destination by using multiple domains.

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 https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8fd5904b---nirarazati.pdf In PDF document text
    • https://austdoorcaocap.com/upload/files/rerotobenepug.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/nexuvijiworem.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/denenolidizapofisuba.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/fifekujatafuzeralalozesi.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/jowoneb.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/41743881461.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/6770100381.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/nivikujinifad.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/93419987142.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/matano.pdfIn PDF document text
    • http://cl-pub.com/files/files/sapuvimotuf.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/25755469921.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/vidaxiz.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/86763179668.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/gutok.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137666f6cb39---xeludedusubozelov.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/vadananobopasefeb.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/44309519726.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/34290564673.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/ritutotuwamelaluvekax.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/50556782414.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/tekomuragedavabiwalo.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/81549934570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=avi+for+android+tabletPDF 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_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 10364 bytes
SHA-256: 86ee240e1788689bd0bee68a0367604fb29fdc13f32f068e5c8ea60363b0b529
font_02_sfnt_off0001156a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 17676 bytes
SHA-256: 8d00d3e93c08d0b38e327b24f25d6430968fea27660c6cf08c80ff910aad8d03

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