Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a92d511e61a677…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 13:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c7d4b21b36a7744ca68981ceea94592 SHA-1: 493083bb06bcede463e4167d1292f325a6c8fd90 SHA-256: a1a92d511e61a67720afc37982364b5e7e59b103bf87a91f60fa5304bbaf2762
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded JavaScript points to an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=flutter+developer+jobs+in+surat PDF link annotation
    • http://wefocusdesign.com/upload/files/wevakululowadarewa.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/jozipagajus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614487505bce7---bokazofejakokigipejar.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/xoxazibegarida.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/jajenufin.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/37687626792.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/70533156319.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/73443762566.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/wonexetusomujob.pdfIn PDF document text
    • http://videocycling.info/files/file/44417849051.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/95164860031.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/bamubewanuvejibapum.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/32658219551.pdfIn PDF document text
    • http://tianfonmm.com/d/files/dapumefaxevapin.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/42728748474.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/guravurinasivosaluv.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/51917563471.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/83782002941.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/91509680135.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/dinivate.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/31032636043.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/sebigejudarinifarazumu.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/61300116498.pdfIn PDF document text
    • http://wwsm-us.com/files/file/4654473686.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_off0000b15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15C 16460 bytes
SHA-256: da88a19a270429de8230a50178b410e2e21e818237d65ff380a23fd46b412f5c
font_01_sfnt_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 10800 bytes
SHA-256: c6251a85ca9cf44ea8ececf4e4491ffb10b722dde917ffff5c23fdfc01c66950

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