Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97bf760db85a322…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 03:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 163f534ba2288184627d33ae13ed4daf SHA-1: ec08f86bf4b8c3f8b544999c26c2ec72a82c6bbe SHA-256: a97bf760db85a322c29e5a7e9f1674d07d7842237879bb5fbb7603e02e9116ce
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 high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

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://oniceh.ru/uplcv?utm_term=livu+apk+download+latest+version PDF link annotation
    • https://abisspaandboutique.com/nbloom/fckuploads/file/93613936419.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/xebagiwarejima.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/35675067948.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/17631574385.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/fuzazumotilo.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/rewebesiginivekezejev.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/10417590869.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/pujodonolaserinavuzatum.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2fd275a30bbccc0a1f9714b32f9622cb/23964505144.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/71048129378.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210902213102_si3uz9.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/tugal.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/kuxusanusutizona.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/12033146895.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/35191010244.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/mujivuvida.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/nulumokadovexizikor.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/73ef1dfe325b5602338ea88e906c0bb2/19917383163.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/96215095520.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/zodovakuwutafuxola.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/lutekel.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/88838883961.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_off0000af6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6D 16772 bytes
SHA-256: d6292a43b450bbe1b578c7036fa357aa4b1bae010d4aa2d142fa1f5d80b5cc91
font_01_sfnt_off0000da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 10688 bytes
SHA-256: d2138b3b6dfe87a6492294bf391c857713ea61d720444c550bf6dfe0e46ef40f
font_02_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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