Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2e44acc8ca2783…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 21:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c4136be72ab1f2f1d606c38f2e6d2792 SHA-1: be17ff0c9abeb89c412e0c3b496b682cb119f9c7 SHA-256: 1e2e44acc8ca278325eceb1c2b049a20a798731b83508250063a4999d7130b57
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URLs, many hosted on disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=super+mario+world+2+around+the+world+rom PDF link annotation
    • https://mn-lawfirm.com/box/userfiles/file/94152617460.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/61108120215.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/12740661292.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/84448664443.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/64597791149.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/venigud.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/netogekowunenawuva.pdfIn PDF document text
    • http://budropol.de/Upload/file/33997248025.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210906160902.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/36186260047.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/zupudojad.pdfIn PDF document text
    • http://espokebar.com/uploads/files/kawebadixenazirub.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/10102579816.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/1854942766.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109120936383537.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/30922766688.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96065867937.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/detanabus.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/tulafajetagiberirasex.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/13327696413.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/wuzapopurubitiwap.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/pimikag.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_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 18628 bytes
SHA-256: 827c204ee24c36b592e1bb63c7cd71275ab3edc13b4cf401b86e3699f39b8306
font_01_sfnt_off0001185e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13075 10872 bytes
SHA-256: faee181381d174730309735ae3f43389783327a56f8c8350213289a973741687

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