Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c962f5254055916…

MALICIOUS

PDF

77.2 KB Created: 2021-09-16 22:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51c10fa5e96ef0601229442d720af20b SHA-1: 9c11a11402d94b4a672a33105bb096535b4bef17 SHA-256: 0c962f5254055916dfe861d50eaf2266174eee6abad3b430e5ef6b74c000a972
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a link farm for phishing or malware distribution. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or download of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b46e4a488---bisulogunemat.pdf In PDF document text
    • http://gemmacapitalgroup.com/foto/file/jilewokajiduxukafegekolup.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/ronufowerovivex.pdfIn PDF document text
    • http://partnercable.com/files/wofupel.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/vazurawefo.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/nojorujetave.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/fopujepujel.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/labojepipo.pdfIn PDF document text
    • http://letdentalab.com/img/files/38724042785.pdfIn PDF document text
    • https://istanajp.net/contents/files/vofositeb.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/11488136116.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/noroxam.pdfIn PDF document text
    • https://noventa.cz/media/files/file/92446449169.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/63661708269.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/74411471150.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/58477859761.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/30010197778.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/zevejinatuxavusuxoxizob.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d8e4ca1e59477e1be67173c70f81794c/62463890490.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/64976850901.pdfIn PDF document text
    • http://djapm.com/userfiles/file/88352766035.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7761510130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=adjectives+starting+with+apPDF 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_off0000cc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC75 10892 bytes
SHA-256: 5a91a8e316356d01fa2b757e976389695541970e2d2b6203cee0065a95629b3b
font_01_sfnt_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 16352 bytes
SHA-256: 05d3125afa0682ad4405d9aabe227760c566cdc71787e3b943624aa48ab22188
font_02_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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