Malicious PDF — malware analysis report

Static analysis result for SHA-256 8726b739aef10ede…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 19:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e0747b29e9e5beeb05e5a60133b5c0c SHA-1: bafb875a2db529cc1e5975e71cfdd632590028bf SHA-256: 8726b739aef10ede38e5b700f67401bbfab6f6a866996d1e9f5c5138609a8f33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing lure. The PDF structure and embedded content are consistent with attempts to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=how+to+transfer+photos+pc+to+android PDF link annotation
    • https://childprotectionindia.com/lexcyberia/userfiles/files/53449125694.pdfIn PDF document text
    • https://ijpdua.com/contents/files/88845108996.pdfIn PDF document text
    • http://apple888.vn/luutru/files/56189189900.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/96613549004.pdfIn PDF document text
    • http://519pf.com/userfiles/files/vokedugaxolekuxuzupi.pdfIn PDF document text
    • https://chp-travel.ir/data/file/42771237214.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/14944389278.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021092219075373499.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/nosakefoponir.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/putipurepe.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/patupe.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161414198e581f---gerezaw.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/17867100861.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/65683272056.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcd4f77987---46134344024.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/velagila.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/xizigem.pdfIn PDF document text
    • http://letdentalab.com/img/files/fonepejomatuteg.pdfIn PDF document text
    • http://husplaza.hu/editor_up/27114466865.pdfIn PDF document text
    • http://espicycooking.com/files/file///sagogevipuzasoxitesawajol.pdfIn PDF document text
    • https://bfull.ru/uploads/files/55396966976.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/bapafig.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_off0000afe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 10748 bytes
SHA-256: be677b824521d6d001d7de895fbe21c27f27f38801fab9de063d8f1c21654142
font_02_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 17088 bytes
SHA-256: afe3667ffc8532262907fc32263446b941188d97697fa22c2a16f2d1e39eb36c

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