Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23c02d86c8699eb…

MALICIOUS

PDF

73.1 KB Created: 2021-09-20 01:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b93aa0de0fcf452eb5be1c691b4b082 SHA-1: 7dfb1539788d3d989b0e3f9a2cc62cc5352a34ae SHA-256: c23c02d86c8699eb96b742d5fc9ce5315731eb2c76a8e7498ca1dd5c207f9f0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a specific heuristic flagging it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the sheer volume of suspicious links points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/31596830043.pdf In PDF document text
    • https://o2opr.co/userfiles/files/wemujixojiperavasegug.pdfIn PDF document text
    • https://majubesar.net/contents/files/newilusufej.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ivuxigemuluzujemuripis.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/6187544531.pdfIn PDF document text
    • http://melvin.cz/data/nogomukeviw.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/zopekuwojazepepije.pdfIn PDF document text
    • http://odumakus.com/uploads/files/ronetuda.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/degaporozixemevabuladub.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/murupurakovinujeviji.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/masaxovanutegedij.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/phdb564sqbvqoqq3o6f1ul33r2/kodafebufuludadan.pdfIn PDF document text
    • http://lex.tj/img/file/82067943601.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/jemegitaleradilasaruvu.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/8419603059.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/48869686419.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/7934847283.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210919002706.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/lunebefiledo.pdfIn PDF document text
    • http://come2menorca.com/images/file/90493957175.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e94edc15e---46330366981.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/zexomowugefobidopos.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/gimekefabupuxajofifu.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/pagurabamekek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=twrp+without+pcPDF 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_off0000bc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC70 10008 bytes
SHA-256: c046302e9af4baa16fde09e3cd3b0358e987fab63253ea09acbe335373130198
font_01_sfnt_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 17092 bytes
SHA-256: e8e751c458ad009d3cc114c45fcab78cfd558218d53c832b41ff526916c576ec
font_02_sfnt_off0000ff40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1