Malicious PDF — malware analysis report

Static analysis result for SHA-256 8759493f21b278f3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-19 19:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bfa9bd712d357f9f06da191fe717b1a SHA-1: 57a02c2c3fd3172ba3d10f75f29ca98c40a25882 SHA-256: 8759493f21b278f3724b2fa52c6c69fcb70f9e7af74149ba51a408e6a4ecf53d
134 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external files, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=apk+pes+2012+free+download PDF link annotation
    • https://hamayeshniroo.com/shop/file/5964941081.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/juxenexipizatuwipir.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/desilarokakomobisu.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/50670149101.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/miwujol.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/riluvadijiwexe.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-13/87f43d785421af79e6bd1381a03c2e7f.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/60649745169.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/bumazurunekoraviforanum.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/muxetosebipopopawexafi.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/39494794701.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/runitinilazo.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/20572441718.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1630473202vesot.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b20084c0b8---30104969920.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/vamuba.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9ee02d72bec0a1cc5b33689d6cf2ff1f/96128282431.pdfIn PDF document text
    • https://istanajp.com/contents/files/98045221039.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/toxuzabapujakolumur.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/92440172934.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/xifupanugivoji.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/datidul.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/36042523566.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_off0000bac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 10756 bytes
SHA-256: 36e952992c94e1d1291309e8fd3c0d41260657ada7d9a298c910f9e2c79b2367
font_02_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 16208 bytes
SHA-256: 03794cea3195076c553c362843fa9e93f969d88848f3525e2c60a1158a9baa1b

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