Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe3cbf702ecbf3d…

MALICIOUS

PDF

80.8 KB Created: 2021-10-19 00:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7ef795894fa2ec8368670f147e255bc7 SHA-1: 07fbe372dc5f4996a324efb4a30002481ab7d157 SHA-256: 0fe3cbf702ecbf3d8bf587578aaf7e5331fc60aa38cf6d873b767d213ae20237
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm hosted on various domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://www.primariasantana.ro/uploads/file/zupaxoririlomivetiw.pdf In PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/19544546063.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/koxipipivuxelomazoxobot.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/sozemede.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109121402439989.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615eeca5f1966---23812537893.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/nobil.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/15459802172.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/riwanopenixurerog.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/puzaroxelafekofug.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/20930602660.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/27141635483.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/jasobarusipirapokuduxe.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/7021815225.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/zuzarateranikajimen.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/96870007814.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/38679912285.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/gipavigofupexop.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/73693728952.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/6524496573.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/34846921282.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210915105216.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=apple+magic+mouse+2+space+gray+reviewPDF 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_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 18320 bytes
SHA-256: 74ec0a433757b478db54eb14929e63a87aaa2b67fae4051cd577cb8d6bebf1ea
font_02_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 10980 bytes
SHA-256: ea42cc9314d817d347226f84ede9e99b1586e555c328b33d4e771a936894dd0e