Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c64a1cca46e0b1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 21:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57617e888314b190d9d736c90bca405f SHA-1: b718bcb4c207604e0f5bc46c403df0242a1f1fe8 SHA-256: 71c64a1cca46e0b12d563a0a84c4ade6566ec05379bb0aeaf56ad4bf3e2beeec
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 0.9974

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://synerhu.ru/uplcv?utm_term=systematic+theology+pdf+free+download PDF link annotation
    • https://qatarsecurityservices.com/public_html/userfiles/file/gazobetumumagejorosisapi.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/95801777144.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/sekivufewo.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/38238276155.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/81813332509.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/mijilifuduvo.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/dafimudodeperitomejexad.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/82822086763.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/95304866705.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/kpmoft9ntsisr17g3i7h746sm9/jolef.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/20119136617.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/vafuguxulosujo.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/35813045109.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/ketelu.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/160058485861331689cca42.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/80825464326.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/nikubafadonafebaxer.pdfIn PDF document text
    • http://indemo.pl/Image/files/xitaketubenuwarorixus.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/zinexemupu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dae6c43e24---xogalazabof.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/sizilipiwevobamubej.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/bekejela.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/vopefugilipusiregapuwo.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/74970019258.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 11340 bytes
SHA-256: d681f4a04724a3baee996f792a6a01bc043e8eeb6f12b50d7012248c1a5b2718
font_02_sfnt_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 17036 bytes
SHA-256: 054890f9782658bd4784920a2ea4e9f2e227b1069c15ae5682f5f9606e31ff81

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