Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fae2acf1e55dde9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 16:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 68a682d5738b9216768d7c82115a87f6 SHA-1: dadd635a5f7efb442cd1628b71e116cf1b567961 SHA-256: 5fae2acf1e55dde96ea5e0c52da2819479b273888f57e52144601d75fdf1d5e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, 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 consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=pepsi+man+for+android PDF link annotation
    • http://easytravel63.ru/ckfinder/userfiles/files/95633233870.pdfIn PDF document text
    • https://digireg.com/upload/20291081487.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/61799510624.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210902_205109_104.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/5831100086141c13c43a14.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210909030935.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/rowujarosava.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/23122325671.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135288e34a31---77955919025.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/11490680731.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/81827300862.pdfIn PDF document text
    • https://mashura.co/userfiles/files/didunobivixijizomub.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/momamavesajojojuruvagute.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/zagoxonunokatov.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/66133750541.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/neruvoseburope.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/74313259559.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/71373560250.pdfIn PDF document text
    • https://ibericadearmerias.com/file/nujubisaturosi.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210902203847.pdfIn PDF document text
    • https://mlspoland.co/files/file/8025290626.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/rilujakufoteturaguzaxipa.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613cb3dddc705.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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 17908 bytes
SHA-256: f333cceb8b122fd1449ff36279986293cf73220e4cc5d800145c9685d1678cd2
font_01_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 10516 bytes
SHA-256: 60c8a2cfcb75a5e83b4519e7b46f7d945a464910ed80fec23750667736024dea

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