Malicious PDF — malware analysis report

Static analysis result for SHA-256 793d7fb06ec1f8cd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 10:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67364e8926abe6f0c18281ec1f913d0f SHA-1: d2a8ca18659d8ea18fd6021115f4c0937805f52b SHA-256: 793d7fb06ec1f8cd138f133eaffb189ef19eeed557d2fbed70578cb154498627
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with a high density of links on disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and embedded URLs points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=webmail+ziggo+android PDF link annotation
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613117ab2d008---1337459052.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/mejif.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/gisepajuniju.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/15563707228.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/52925360192.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/64785441291.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/36743380407.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/kalijerifawerukafado.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/kararuxinokegufoforejemuj.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/govolokuvixenom.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/17391739946.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/wefuka.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/zudubirumenizosuwadaku.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/85832940640.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109011857196351.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-5/20210905025851911385.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/lopovemowitotikomemap.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/19309538412.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/posikisolifonereb.pdfIn PDF document text
    • https://wineart.online/userfiles/file/temijojitiziruxadad.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pabafukiloratemino.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/pivoxujitemera.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/55708011039.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/raguxibujifiwi.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/19445221632.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_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 18820 bytes
SHA-256: b7de407f62046ae16ac5b04d88df0c0cbb2e8df2b46426dea69b396d87b09da7
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DC 10516 bytes
SHA-256: 162fbb9794ab815904bb30be9bb8cda9a54b791312ffb0f527fee771f9620945

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