Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f467f6f1e60fbff…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 16:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5dd3a463092a8cf76972c2bece2b66b SHA-1: f781e9e2c9a33c3bb84ffbcbab1f658b41cfcbbe SHA-256: 6f467f6f1e60fbffba32079bd5d8384399fb7dd246563f228f9000ff479001be
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 pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=download+pokemon+ultra+sun+rom PDF link annotation
    • http://tythb.cn/uploadfile/files/zafuxuja.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/zaxiwixigezinasajese.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/defevotakefipufufanodivap.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/35399781605.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/papekugobisakemanowog.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/43445429794.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/60478125693.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/28103076175.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/26213937464.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/6174390084.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161432e9289b90---35197682561.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/setalikutanoletumejupo.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/bobemubifaxefebi.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/vurobo.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/liwakufezona.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/lafijixipiwefazikamob.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/18250265909.pdfIn PDF document text
    • https://businesslife.com/content/file/fopalakebasiwiperaxawa.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/letipojud.pdfIn PDF document text
    • http://taxfreepoint.com/file/47056589169.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/71604876829.pdfIn PDF document text
    • http://snft.ro/media/file/tivifiz.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_off0000b8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 10740 bytes
SHA-256: fd411043b02e7058d17644e1ef1f75deb4900bbda662d195d84309d2de6c5bb1
font_02_sfnt_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 17196 bytes
SHA-256: d950fb08902775543a1a9e7cde92ffe2138c8a138071afdf5feaec9c260c5c50

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