Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2677412ee4d2f7…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 17:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8769acf0ff9741b027c769894d6643ed SHA-1: c2a14545b62d1664efbce5e4a8f61ba73515d94f SHA-256: 6e2677412ee4d2f736cdaf8f39082c27aed82713601e7e92e5c4084ca51e8fd0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs and a heuristic firing for a "link farm" on disposable hosting, suggesting it's designed to redirect users to various external sites. The presence of a "download button" heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=dear+comrade+tamil+movie+download PDF link annotation
    • https://motecx.com/images/file/dabipimeka.pdfIn PDF document text
    • https://emmaushuis.org/pages/21027171682.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/xuxateratejelamamusupi.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/56337519067.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/18286743990.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/zawolabigofero.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/gidufopomoko.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/36786430055.pdfIn PDF document text
    • http://www.77ice.com/upload/files/43476957953.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bezikodutalis.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/sojikodewuverilaxejo.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/musixevo.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210911020328.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-17/20210917075924493731.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/53227949290.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/gebizipunapuxag.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/84019734586.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/leruwavenixiko.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4qhihppgm149mpgmoc4itt07ud/lasipufajopipumibuxolus.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/puseg.pdfIn PDF document text
    • https://energooptima.hu/upload/File/tigukajuridawuma.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/60901587243.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_off0000c55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 10516 bytes
SHA-256: 0d5d4421f26e108c231661e629ca6a3602a387917fe137e5f7ce4892c4803332
font_02_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 18648 bytes
SHA-256: 391e95625d6c7c4a71c8a8b8e6db6b82dc8c7c5f6a81017107fcfb625bbfe86d

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