Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0befeb33977f2c…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 02:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de3a6154323a5f95653b2e9b2c3f7223 SHA-1: 806190979c533000974889a998641264fb8191a2 SHA-256: 1c0befeb33977f2cf23a51c19cc17de0f0dc16ce82f806b2992f3ea52e8af7c1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external links, including one identified as an algorithmically generated URL, suggesting a phishing or credential harvesting attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=streaming+jumanji+level+one PDF link annotation
    • http://metabolitplus.ru/files/file/90494722183.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://xaydunganphubacninh.com/webroot/img/files/88737084104.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/63419871666.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/47302442317.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/5094957894.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161403d8342ee4---molibekenurug.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf605cb3e2---11349428076.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/69497006700.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/bemivotagotagareru.pdfIn PDF document text
    • https://vzglavniki.net/data/file/fosefamefinawag.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/virepo.pdfIn PDF document text
    • https://pindimana.in/uploads/file/4578517907.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/58487257652.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/zokugifejekavizuv.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/88982907676.pdfIn PDF document text
    • https://majubesar.org/contents/files/forivedajufutapelatagawu.pdfIn PDF document text
    • http://techbis.pl/files/file/21668215109.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/97292429298.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/soxuxokopizevebon.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210902143829_ptp0t9.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/xozupetomuf.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/37477813598.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/butoxivoxagu.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/78392149896.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/25463281009.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_off0000b786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB786 10656 bytes
SHA-256: c6eb8237eff9197561e6914a9bb09b743eabd5753e0a14773df3816da592d2b1
font_01_sfnt_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 18520 bytes
SHA-256: 8f19cdce825ad7bc0a20f561be9bebd7c906f1874ce278b4d6e9886e102382d8

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