Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2e41a990cfc93d…

MALICIOUS

PDF

82.7 KB Created: 2021-10-05 14:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e06e686de7f3fc93f740551a92bf25eb SHA-1: 413e7a1eeef77edb4809dc0ad924ce36c4ab0636 SHA-256: 5d2e41a990cfc93d8eb7d349c5a9eef83fcf867ace9517b9d1453a9ee774f807
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and are likely part of a phishing or link farm operation. The PDF structure and embedded content suggest it's intended to be delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=can+you+not+ovulate PDF link annotation
    • http://uk-finansist.ru/userfiles/file/tumebebukixi.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/34198100002.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-9-23/20210923222703966586.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/lulukatafakavud.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/bilefu.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/romorobito.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/23446588021.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109210206546516.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0d4b2e74a8042a64fc44fcc57000d080/vomupasivexomada.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20211004235628-23333937291.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/jipul.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/mivisugu.pdfIn PDF document text
    • http://pmke.cz/pictures/files/wezufebapinasadizavidufu.pdfIn PDF document text
    • http://dejonghenico.be/sites/default/files/file/begukosuloniwisotasu.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/3354240235.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/27821015972.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/xinazipigekem.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/sisovukevuvedapito.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/20850570800.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613054d5dc73e---4553048334.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/60850380392.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/gosimasurema.pdfIn PDF document text
    • https://s3mail.tenten.vn/js/ckfinder/userfiles/files/kuwolexivenadawabolut.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_off0000dd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 10052 bytes
SHA-256: 9b03f29680d7f8a25335b28dfe46e66f56a369f4c2ba63bf485c260e90b226c8
font_01_sfnt_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 19048 bytes
SHA-256: 6ab5c588271cf0be49d6722ccd62c88e248641b0f4cb23a4e4dae2c951a0bb4d

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