Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1792b9edb3c67c1…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 23:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 12f2448039395a9d10573a1bfecbd872 SHA-1: e59ba6c49a57af96befcb8b3bfd805cf6edafee5 SHA-256: f1792b9edb3c67c16c80cc64f5042725fcca33030c507be983ca727c3e1feeda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, with one heuristic specifically flagging it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious content hosted elsewhere.

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 http://tareeapartment.com/user_img/files/murepiludiputeputagaki.pdf In PDF document text
    • https://inverpalmas.com/aym_image/files/muvokinosajegunogazabofa.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/58546156012.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ed6928612e152df5f725c5c000ec6b83/20472834274.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/jikamikivibavuxejukupuki.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/doxugelosato.pdfIn PDF document text
    • http://philboyd.com/melizeserepimorikukeju.pdfIn PDF document text
    • https://path.mn/userfiles/files/47439231434.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/joxexeralo.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/zovitetebovo.pdfIn PDF document text
    • https://parkettworld.com/upload/files/68863641797.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/85584912569.pdfIn PDF document text
    • http://ymmicro.com/files/files/75412277548.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/werikuwadafakuwebavir.pdfIn PDF document text
    • http://exosushi.com/uploads/files/lunutonotuzogosiguzexape.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/19933730572.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/tatatejoferukupeninoxuwo.pdfIn PDF document text
    • http://sergeybazarov.ru/file/1580830065.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/laxakederijokajesas.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/97779777678.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/23931937539.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/52894240687.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/84323031096.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/19276388924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=all+time+best+android+appsPDF link annotation
    • 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_off0000b7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 18336 bytes
SHA-256: 9021ae57948165ba97d0392d49fe596f67fa4e034df467148108cc1ffa809ac4
font_02_sfnt_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 10676 bytes
SHA-256: 7ffca9aef2b5ad73fd5109685f0d08dc0804849cfcf768b08bdfd697d779c939

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