Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3f5561d1ba7bb1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 15:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d9e167fb69f733cb87cde01d5c06258 SHA-1: bc1edcb31922d129aa36b69201bbee66fa07a4dd SHA-256: 6a3f5561d1ba7bb1f7e09b14376f7277c062b634581647613a4b7c392c7834d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external links, many pointing to PDF files on various domains, indicates a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://saconsultancy.com/userfiles/file/nanepupodapatetuge.pdf In PDF document text
    • http://fsgzb.com/upfolder/e/files/20210912042010.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/25041171990.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/xomeneki.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/30301569125.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/95474801013.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/95529749175.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/jubiwawaxoruk.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/povulubusezogozelenitefiz.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/63593372828.pdfIn PDF document text
    • http://crc.creativechange.net/ckfinder/userfiles/files/zorugivizabebuxatuta.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/65360050728.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/3123254807.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/89804219162.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/90259205101.pdfIn PDF document text
    • http://mobiliteit.nu/files/32705727435.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/joromam.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/roxewuzenamemupubiwu.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/dudatifufiga.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/damejejanojupuluzegif.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/gigaxixa.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/98354757511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+for+all+fortnite+map+codePDF link annotation
    • 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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 17116 bytes
SHA-256: fb60083b60e31549b582e4f077156c60a8f300ac25926f1f8efaf042c23bbeb5
font_02_sfnt_off000122a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A2 10592 bytes
SHA-256: 8cc9c366064a3aad5ad97c329c7c084c253b402537ba301c2c5646bf151ac60c

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