Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefc830e782732b6…

MALICIOUS

PDF

68.0 KB Created: 2021-10-18 10:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 587f4db87552b7e6da837f09aff71809 SHA-1: 00908ce4c385ef152aa3cfbedd5734bf635a6129 SHA-256: fefc830e782732b664090791b877824782b032c798abed5c1c6ad0a4474b973a
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing or malware distribution. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 5

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://commandhousecreations.com/uploads/files/dusonerazisejevef.pdf In PDF document text
    • https://lecachet.fr/docs/files/90851674724.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/jogewuwaz.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/84699889032.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/jeror.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/zepazonanerotafanedusuzek.pdfIn PDF document text
    • https://paramourpourbebe.com/userfiles/file/jepedunefonesaxof.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210909060825_2144540888.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/parama.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/sonajokonekawo.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/91111594353.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/pitiniwe.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210901051133.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/87530271657.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210919075344.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/zezepidirekujideguni.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/80605459931.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/derogukew.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0397221001632729734.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/jifuxadubi.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/12896717705.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/2821943063.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210929_064651.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/molewe.pdfIn PDF document text
    • http://www.moyekolodin.com/files/beninelatiruxurenete.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/5922482915.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/4dZi1sgP-vI/uplcv?utm_term=cater+in+a+sentencePDF 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_off0000b0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CB 14172 bytes
SHA-256: 4d1f9d6a6eca8c3b35d4fc299a178ea7e66c4aaff97ca96b4991b5fd485f69dc
font_01_sfnt_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 10088 bytes
SHA-256: 4c77a51c9d1a8e0f6c3de90c5ad374bf356d415380f4cc5b975fcbc6ac29bfad
font_02_sfnt_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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