Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bf64e1b4bdbf3c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-21 17:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58cceeb07031de3a695a7f6cde1a0048 SHA-1: feb0165369f3678b4bcdda0f71c0f9bce3265161 SHA-256: d1bf64e1b4bdbf3c8da0aafa8b6544bde3b0e9fb2bc328b875f10b9700233385
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=iphone+emoji+keyboard+app+for+android PDF link annotation
    • https://minjar.mebel18.com/uploads/files/79134875161.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/vusivijan.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/movinuleramuwulusuwo.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/68390277440.pdfIn PDF document text
    • http://asja.ua/userfiles/file/sipoz.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109152147036315.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ee34e86c5876ffaf8d684429d909521f/fuwujexejorodadutalisoz.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/pisumelalab.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/sisiliranoborutobuvag.pdfIn PDF document text
    • https://music-group-store.com/upload/files/vibetezuwa.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/63877801990.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/damogomojefazolozotiw.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/nuker.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/xatowifituke.pdfIn PDF document text
    • http://gerocuki.hu/user/file/xaxutuv.pdfIn PDF document text
    • http://getdol.com/page_data/file/15936209758.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/6639746003.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/lokugilebutazu.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/9256021235.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/79tfmj350e5qilf9o4q43vhn33/39296028112.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/69753093492.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/38547541365.pdfIn PDF document text
    • http://12shio5.com/contents/files/puginanegid.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/menaji.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_off0000b986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB986 16004 bytes
SHA-256: 25aefc2df914166bb5beb10b51edf8f32d09f35521f4ab3b422ffac4e15301f8
font_01_sfnt_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 10880 bytes
SHA-256: 06cb2831afb69f5f74649acde273ccc6fc122775e78674e4b47649c6fb9ab76d

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