Malicious PDF — malware analysis report

Static analysis result for SHA-256 453f50b7bfbced49…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 05:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23ad20221dc74dab2e018506be675943 SHA-1: 1730a352239cc5ee69b96afd3e64866620074ddc SHA-256: 453f50b7bfbced49a9a4fb1fa7617fe0a7028d31b6b2c04730e8706031056b03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=nba+2k20+apk+for+android PDF link annotation
    • http://eminenceinc.com/userfiles/file/24648803027.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/rogixemosol.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/nibadejiforitok.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/fakavofuvamijoxuwirupo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16143b1656ea80---36900523264.pdfIn PDF document text
    • http://newo.ru/files/files/pegow.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/towonisituxokosipujato.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/vekobomuwodobolozeg.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/bizozakisukixa.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/kerulenelaseroxuvubafeper.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/40528702282.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/fosixa.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/61091922030.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/41969175128.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/94045352910.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210916_DF3C1ADAC6B93515.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/giwejeselojabalaviju.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/nadumenubakitik.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210908235316010232zi6bv.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/49308471417.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/87716184278.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/2273015584.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/fedupibojetik.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/96004422698.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_off0000d920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD920 10496 bytes
SHA-256: 9e70fd905561d842acde86ee3e6a216146d67577463b81244c5f945ec61386b5
font_01_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 17508 bytes
SHA-256: 02dd02e7f126b84322f34087260f1a5de495f93bf1044970d05b9e718c3d0493

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