Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4eea23b6d2f1d15…

MALICIOUS

PDF

79.8 KB Created: 2021-03-21 08:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f9a4ba49a8d0c39e5bc5aae3c3b243b2 SHA-1: 2220ae1fdf17ac32c04a88e5d891aa38e084ec5e SHA-256: d4eea23b6d2f1d1527393cd43b4aa4826356ffb752072513574121ad0dd2607a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/award?keyword=aula+internacional+1+libro+del+alumno+y+ejercicios+pdf PDF link annotation
    • http://idealica-co.site/d-link_dsr-250_8-port_gigabit_vpn_router5p1sz.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/sefupegozate_xulopigelo_pikobozaja_zulawoxajizufo.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/fujiwav_titisamikom.pdfIn PDF document text
    • https://buwolipirawelas.weebly.com/uploads/1/3/0/8/130874522/2246921.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/nuwiwotaguz.pdfIn PDF document text
    • http://insuranceautousa.com/99705158064m9u1t.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/iaghCjg/5843126297.pdfIn PDF document text
    • https://cdn.sqhk.co/vutabopi/jeigicz/jobugorafu.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/gc3Ciir/icc_cricket_match_live_score_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/4ihfS5h/black_forest_cake_rate_in_madurai.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/beb9e09.pdfIn PDF document text
    • http://megatorg.ru/what_is_the_best_robot_vacuum_for_carpet_and_hardwood_floorsysz24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/satuja/excel_vba_tutorial_tutorialspoint.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/fogikemiwabakoz.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/yamli_arabic_keyboard_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/girobijaroxod.pdfIn PDF document text
    • http://wurebosuloxu.myartsonline.com/likaxizituta.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/google_chrome_old_version_43.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/kejomegaluzazezorevob.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/identifying_nouns_worksheet_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/92095186794.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/8449755144.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/25616745811.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 5544 bytes
SHA-256: 9a3ec8b3ab2d8b340abb93a1063fdbb7eefba951f8320da851dbf5f5702054ad
font_01_sfnt_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 13896 bytes
SHA-256: d68ec67ab6b65d5a9cd419eb09a560afa7f654011cffd70f8ab76397d79fd207
font_02_sfnt_off0001213b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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