Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c247c4a2016c65…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 09:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e306d2486f26f4f80bd58842074c095e SHA-1: 024b4a37bfabd149e03da887d07f5fd854cfdc7d SHA-256: f4c247c4a2016c65e387ea481f0fed4c866f9fef56b5d14ed75e8fe41540553d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to link farms or disposable hosting, indicating a phishing or malware distribution scheme. 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://huntic.ru/uplcv?utm_term=how+to+convert+installed+app+to+apk PDF link annotation
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/2iu5no1vguvg6hijt871sakc61/mipoludotuk.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/05/file/20210905_015253_108.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/wetekanumobejobebafujuj.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/10161725376.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/zubumoziri.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/rokajerudakijuvobujozoro.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/kazegiterulow.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/megurozanurozasog.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/12508335628.pdfIn PDF document text
    • https://thietbigas.net/media/files/jekeginavidal.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/fokamelisosura.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/vomajurufufuladeruboxekav.pdfIn PDF document text
    • https://steammining.com/userfiles/file/8957630209.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/zobesupujifaxowugi.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/wevores.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/bawopetidok.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/wejubekodisikutasukexurel.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/13634747910.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/widirikemiwozebamideles.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/tenonirogevabutinusup.pdfIn PDF document text
    • https://dptech.vn/uploads/files/78839976599.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613808f44f986---sijaborudoj.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/japosokoxijinubawimutu.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_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 10744 bytes
SHA-256: ed3d7eab6b2296811b30917eac9e53dce61f965900fd46885dd3ea082ff86d16
font_02_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 18292 bytes
SHA-256: 5c3e83ae86b7836caa4b774c88000a3429aed3ff62081c36ebd8702b39e1a032

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