Malicious PDF — malware analysis report

Static analysis result for SHA-256 28358956120c529d…

MALICIOUS

PDF

77.1 KB Created: 2021-03-04 07:21:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 901b4f28d28da75c8f025dfb3f804a51 SHA-1: 6c5334fdd81e5128bba88e5c82c114419e8891ee SHA-256: 28358956120c529dbaedc9ab20a0485da5ce03e94c27df7b2801c27ec9d8ff67
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to contain a lure related to world population statistics, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=cu%25C3%25A1les+son+los+pa%25C3%25ADses+m%25C3%25A1s+poblados+del+mundo PDF link annotation
    • https://cdn.sqhk.co/mopewedote/gdJq8hi/jipiderezedozarup.pdfIn PDF document text
    • http://dipurenirexo.22web.org/80222450405.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/hUgdOia/chopped_iceberg_lettuce_salad.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/dhQghTT/guseluwegisesonajix.pdfIn PDF document text
    • http://jotelefaxomawut.22web.org/58090073320.pdfIn PDF document text
    • http://limebago.iblogger.org/feat_of_daring.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/qagfPEA/can_i_drink_bubble_tea_while_breastfeeding.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/DQjaWqt/android_file_manager_for_windows_xp.pdfIn PDF document text
    • http://meetcabinets.xyz/3289554830640wja.pdfIn PDF document text
    • http://eurosett.net/nodavobcgjbw.pdfIn PDF document text
    • http://depupejaxidolip.22web.org/21692182498.pdfIn PDF document text
    • http://titanovyi-filtr.ru/notomubemupuzejezavaja7nnoe.pdfIn PDF document text
    • http://dektesheff.xyz/4_pics_1_word_6_letters_red_carpetvm7j5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://banodinetawapi.rf.gd/quran_arabic_hindi_translation_mp3_download.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/applied_mathematics_information_sciences_letters.pdfIn PDF document text
    • http://jofesosozofoso.epizy.com/sri_formato_anexo_gastos_personales.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/70046092383.pdfIn PDF document text
    • http://pagupim.epizy.com/naming_ethers_worksheet.pdfIn PDF document text
    • http://jomewudixaf.epizy.com/5470693911.pdfIn PDF document text
    • http://pepajefosub.epizy.com/48558012788.pdfIn PDF document text
    • http://vilewol.epizy.com/renault_blaupunkt_radio_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 5344 bytes
SHA-256: 2bd266f9d112019b00e092257711e0edb4c22f0f99f12493644a001a737bd6cb
font_01_sfnt_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 11496 bytes
SHA-256: cac33cf2f61a7d02e2e37cd53659becaeb20db0823a8af7db337592ddfccae1c

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