Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74e74b9d5ee55c5…

MALICIOUS

PDF

79.7 KB Created: 2021-09-22 09:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f2b47151f462090eaed0a10b7719ca0 SHA-1: 1f4eb1820bd2de5247b30433ca0a2f46fe5119f0 SHA-256: d74e74b9d5ee55c59603c4747824538405016856fee2f4e9630775e793138dd6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=structure+of+monocot+stem PDF link annotation
    • http://osmed.cz/app/webroot/files/files/xexosarurusu.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/tujigu.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/figapupilafojumiw.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/semizojamu.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/93055323003.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/rupowawu.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/waxijewetofaguxezixu.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/lopimasituvipomejonugip.pdfIn PDF document text
    • http://cartopack.be/Images/file/41951443690.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5bbbe096---68227017852.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/27062165644.pdfIn PDF document text
    • http://gespk.com/userfiles/file/28967642633.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/56561937514.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/19250650830.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/83772432215.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36943784325.pdfIn PDF document text
    • http://unsersohn.ch/images/file/79373168566.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/dedexezodogatesini.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/16599400285.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/22659865621.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/migafolenemixovu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/tutetefopanilaki.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/35830404524.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/lukurananenasevanefo.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/xodenobuzasusu.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_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 10372 bytes
SHA-256: 7105022110134702425d3a1744b2acff6a0b7cc6a64422c309c645f7a4578569
font_02_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 16472 bytes
SHA-256: 7fd9cd15480569f8ae43596902690e03596317d437f432af8bd3c43e92176cb1