Malicious PDF — malware analysis report

Static analysis result for SHA-256 87905b32c0a148fc…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 03:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6aa6c31836ebf3bf80a9dd2ebb77be74 SHA-1: 672009b09cac4478e72d1eac6ba8667434dc5ae8 SHA-256: 87905b32c0a148fc1aaa76e71bf7119191a3598438f14e6bae202d74311c5c7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=club+vegas+slots+2020+mod+apk PDF link annotation
    • http://nsdadventist.org/FCKData/file/xatujifon.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/ribajujevunuvawo.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/babeduz.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/maxenekajamolasipowatodov.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/9548614271.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/46039405141.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/74560422948.pdfIn PDF document text
    • https://rajakedua.com/contents/files/38631369336.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/16336973742.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210914111648_gouetl.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/47891000017.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/75216469076.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/lumis.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/nexarasigagivak.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/99192600295.pdfIn PDF document text
    • http://ranjoysarkar.in/FCKeditor/file/fodino.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614178cbc07ec---rarulufon.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf3f988a6---zegigefevipixuwaseraj.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/60817701199.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/rebotitasevorumelakase.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210906_100040.pdfIn PDF document text
    • http://soc-in.com/data/media/files/tiweda.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/loxozixivin.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_off0000b0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F1 18004 bytes
SHA-256: 0ee0cdf8b7d8079a08594f0d40e96718c83e18177059fd35215af7c44173f3dc
font_01_sfnt_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 11108 bytes
SHA-256: 2bae39957c6ac598755a32539d32180c64382a9e27a36989878712cea85010ed
font_02_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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