Malicious PDF — malware analysis report

Static analysis result for SHA-256 977fc3fdb031c6c0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-24 00:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e31349b3d6bfc29dee2924d09fff4b4 SHA-1: bd7ec8906a7b083816dd04057de5bb27c3bb1b2c SHA-256: 977fc3fdb031c6c05101115775c450e6e37e178375e1387b4a359edfd9bb46c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous external PDF files hosted on various domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript and numerous external links indicates an attempt to execute malicious code or lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://nagakuratrading.com/js/upload/files/jozudibajutixeruxu.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b345258e3a---47797706936.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/zuwidopas.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210920222715_2018464648.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/mominimijidiregiw.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/gumuwakugimojuxugorodofu.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/nijenulonuz.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/besigufalubewaniwamaxes.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/22174530761.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/jugifusav.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/zupifisogimizumopelip.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/jilusuposi.pdfIn PDF document text
    • http://goldmustang.ru/files/files/nukazoremik.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/nugepalilovomakekulilit.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/90104151554.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/zagodopimofepojowa.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/tubipedut.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161384a42b2672---fokufidurasikuguteke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=battle+royale+android+gamesPDF 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_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 10760 bytes
SHA-256: 5f7439b007688ba3f0c8313dc94982b51361ba7401908749a4443c2d6ff2a201
font_02_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 16872 bytes
SHA-256: 7ffbe84c23fda05f35b717affc9f0969d59aebd62734a194d81092ac18b2c3a9

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