Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26385f9ef07d092…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 11:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 787d08311862091824df74719446ca40 SHA-1: 22781ec248640a23f5e0c945c15d632f770b7eb9 SHA-256: d26385f9ef07d0920a539eb45e01b2ca4af522df26b37806374f4daa8837dcf2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=best+atm+finder+app+android PDF link annotation
    • http://saga.diamonds/uploads/ckfinder/files/furen.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/nonoditurejijeget.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/430095895.pdfIn PDF document text
    • http://pronobile.de/catalog/file/rowewulimagexoruwivugowa.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/metidozosubedo.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/gogasirizomegigodigar.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/molusipokorobamib.pdfIn PDF document text
    • https://dptech.vn/uploads/files/24827050734.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/26247588774.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/babafamom.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/4805800748.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/15623677686.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/23473321029.pdfIn PDF document text
    • https://jobtiara.com/files/files/vesomumaki.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/fuxobujebelikexa.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/guxeturifeli.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/13670670228.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/dimulezolimisikasisitomi.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/57900263871.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630553384.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142106c5ef0e---94811909696.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/dolupusesepefa.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/fifazigujisekavo.pdfIn PDF document text
    • http://potya.com/kididipomezupusivem.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/panizedumuwezavu.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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 10664 bytes
SHA-256: cc1433780610134907928d291027fa1b5cd4026778a90805c6d869380fda3eaa
font_01_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 17364 bytes
SHA-256: 214ff27708e685b3f2bd65d94c5e66c05d23dca48e03a6f06287c257e4d0d709
font_02_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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