Malicious PDF — malware analysis report

Static analysis result for SHA-256 19181fd9c72bfa83…

MALICIOUS

PDF

75.0 KB Created: 2021-03-18 14:30:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7af4f5903b2cf07961711e03de2b45b SHA-1: 11c65811c8d9db7c373b07cda1eeae3b310a5636 SHA-256: 19181fd9c72bfa837c9d73106ff4cc4bf771cbc8d945abec4dd010c3ecb7f5f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the document is part of a link farm designed to host numerous external PDF files, with one such URL being https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/xiwexa.pdf. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=banking+test+papers+pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/xiwexa.pdf
    • https://cdn.sqhk.co/nudizodi/YF05uIo/63465274958.pdf
    • https://cdn.sqhk.co/filodomazora/fgjhbji/74330591245.pdf
    • https://cdn.sqhk.co/ditetijesi/8gigiQt/fixeto.pdf
    • https://cdn.sqhk.co/vavefamixivi/bZjcghQ/best_app_to_play_chess_with_friends_online.pdf
    • https://cdn.sqhk.co/tinipuded/1w7vNGW/6356708836.pdf
    • https://tubufuximenijo.weebly.com/uploads/1/3/5/3/135304690/wusokot.pdf
    • http://top-shop-store.website/selenium_interview_questions_and_answers_downloaddmqoy.pdf
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/jivawagafaj.pdf
    • https://cdn.sqhk.co/tibatojo/eeidgjv/reverso_classic_medium_thin_forum.pdf
    • http://uchebnoe.website/zojuwakcz2id.pdf
    • http://levantegroup.net/16691859183onuc3.pdf
    • http://befigter.xyz/computer_dictionary_free_for_windows_10ff2h3.pdf
    • https://cdn.sqhk.co/xoxamomajil/dubhfie/finovezexigifodutajusuj.pdf
    • http://test123test.xyz/arthroplasty_journalttpsj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_c3d9a558fde7487e9c4a3b4af957058a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/679f8ea2-239f-40df-86a3-9ffdd279dc28/jexatawo.pdf
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_4790f0d048144c05bfaa4e1d487c837b.pdf?index=true
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_4a566af4f75a415f871c6fca5d022e89.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cf8ea37d-bf8f-4833-836c-8ebb598e0abb/daguga.pdf
    • https://uploads.strikinglycdn.com/files/3e38bd60-7362-4ce1-b5f6-99c0c0a374ab/zakejubewogusasek.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed84.bin
076498dc11deca7f86e5756bb558351f760ee96973f11821ca13d10c99e27e45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 5292 bytes
font_01_sfnt_off0000ff9d.bin
b4c097becb9b1bc5a6994ad5514b1acb07c9eaea739c383172d13b0078e2bfb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 10852 bytes

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