Malicious PDF — malware analysis report

Static analysis result for SHA-256 850a6d06d1d72efd…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 14:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b95df47360c0ecc68f793b9efe92c018 SHA-1: b494a0390e674d5a7560b242f09a3d42389aa31a SHA-256: 850a6d06d1d72efd3d5164723b980e946d001cc210fb118034e7687fea92ba1e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of an embedded JavaScript stream (T1059.007) suggests the PDF is designed to execute code, likely to download and execute a secondary payload or redirect the user to a phishing site. The numerous external URLs, many pointing to PDF files on various domains, further support the attack pattern of delivering malicious content, potentially as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://durimawar.com/contents/files/96746679216.pdf In PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/piruwobixuveg.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/89571446294.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/2770986525.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/gakugidemulaba.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/70060676652.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/kaxijimajopoz.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/telorofevirerusijasifasav.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/rupivududadepebavu.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/2767308899.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/58296272193.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/16432587039.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/70747178073.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/79988637727.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b437c8855---78680195425.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/31905047527.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/wasuroxu.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/35768873761.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/67770949444.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/sakotusozudezawibonatobul.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/48123605444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=contact+number+ringtonePDF 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_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 17756 bytes
SHA-256: 9b4b44ef69b796b5d1c828592cbecfcdded3ad1d11554ebb10c0a597b1134a27
font_01_sfnt_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 10628 bytes
SHA-256: 4ffdc94e4823ac766648c4fdb2db431aaafc0c9cf0986be0f2ebe08380812c39
font_02_sfnt_off00011c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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