Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd378446074b9e4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 23:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1008dce5e33ed12ffcbcc8ead3778240 SHA-1: 7f658d619a824091cae733260c9756236eac892e SHA-256: cbd378446074b9e471e0bcb3279b06ff0fa76bedfef6c05e7cbea4a8a3a23a5a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified 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 hosts a large number of external URIs, many of which are on disposable domains, indicating a link farm or phishing lure. The presence of embedded JavaScript (T1059.007) and the nature of the document as a potential lure strongly suggest it's delivered via spearphishing (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://cructi.ru/uplcv?utm_term=aprender+electronica+pdf PDF link annotation
    • http://kiuruvedenlukio.fi/tiedostot/file/3755667470.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/50356420808.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/jalogemuvefot.pdfIn PDF document text
    • https://edusfera.pl/upload/file/19939475837.pdfIn PDF document text
    • https://t2sc.me/userfiles/ravozufexizexiximam.pdfIn PDF document text
    • http://mobil-tech.com/files/38571769626.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/motarorarenonelowijo.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/zuririvilazofusef.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/5492668305.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/67969743286.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/boxivatijog.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/84774478800.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/siluwixolibexepo.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/1118607510.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/91019756103.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/81819663710.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109061632228612.pdfIn PDF document text
    • https://andrejc.si/files/file/99876562939.pdfIn PDF document text
    • http://clingac.es/d/files/bufosidito.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/31445209703.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/vikis.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210918204232_775675595.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/suzojupomemotu.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/77973111507.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_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 17708 bytes
SHA-256: 3f6322e2360e6f742726db171333644ee374b1326d1d24d9651bd3835b7ad224
font_01_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 10424 bytes
SHA-256: 89b90126c238ddce40d5ac6f8d3c6488c8f7d36a4505469a2d278abaa1ac2127

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