Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e353df5b5afd740…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 14:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7ee7c7fd2099ce7b5a5d397055c3db9 SHA-1: a4a5fed83c6c0c30d6389635a5083997959ee252 SHA-256: 6e353df5b5afd7405095fc8f63da2740b5fb86abbfb7f4bce49b29fbf3f2bc5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, pointing to numerous disposable domains, which is a common tactic for phishing or distributing further malware. The embedded URLs are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=unity+android+build+and+run+greyed+out PDF link annotation
    • https://mariellatriolo.it/public/file/93490936785.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/nanabiruga.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/kugivotometat.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/nexobikak.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/78794953533.pdfIn PDF document text
    • https://csodamalom.hu/files/files/66633577355.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/49370199014.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/wumojozuwodejagediziw.pdfIn PDF document text
    • https://alohasafaris.com/files/lonerupixuxoguxebixad.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/zikanifenigetadevav.pdfIn PDF document text
    • http://soles2walk.com/data/file/23514827603.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/53330446108.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/jamituwakimi.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-11-12-27-06-20.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/gisakoditavefisivobuteg.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/jalasojawedaxazofajexov.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3033ce82q1ffva46ofbuvlte41/74003787892.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadd947f25---wozijotize.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/27755033193.pdfIn PDF document text
    • http://17njl.com/userfiles/files/90080092706.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/74375602401.pdfIn PDF document text
    • http://cold.lt/userfiles/file/66947879590.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_off0000d03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03A 19536 bytes
SHA-256: 6464619b4b12530d974bc3c8d16fad96f110500767084c761f40ea731bb561dd
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 10616 bytes
SHA-256: 70948c46168a81fa78b6e216f0efa6b51b866b8b7517014227942bf213fa3b2e
font_02_sfnt_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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