Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa13b64ee2a6c85e…

MALICIOUS

PDF

65.4 KB Created: 2021-02-13 04:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7fc20f7cf7c1d27231bbc8132c04da32 SHA-1: 6b12b472672374f24eb9a3cf5d83294221a93fac SHA-256: aa13b64ee2a6c85e3977e94968979cca4061a8f898404f0b64454e12135350b9
184 Risk Score

Malware Insights

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

The file is a PDF containing multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'disciplinary investigation meeting template', likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://crophysi.ru/wb?keyword=disciplinary%20investigation%20meeting%20template In PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/34002925698h8xb3.pdfIn PDF document text
    • http://esplus.pro/32351058666cpv9u.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/all_songs_._zipd2io4.pdfIn PDF document text
    • http://crubr.space/language_proof_and_logic_2nd_edition_solution_manualhxwl2.pdfIn PDF document text
    • http://neojust.ru/off_road_buggy_planscr4zl.pdfIn PDF document text
    • http://onsideball.info/66302886789k6eqk.pdfIn PDF document text
    • http://dimabigeteg.iblogger.org/mijovoj.pdfIn PDF document text
    • http://izzzaaa.space/biophysique_coursmbm0x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luremugaxufarup.epizy.com/wexalozukebupukopo.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/medical_certificate_template_sri_lanka.pdfIn PDF document text
    • http://zugotival.epizy.com/loxogumuse.pdfIn PDF document text
    • http://jodonurinifos.epizy.com/41964476283.pdfIn PDF document text
    • http://zovixis.epizy.com/como_descargar_antivirus_gratis_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/accountant_appointment_letter_format_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/68892648992.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_off0000c267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC267 5416 bytes
SHA-256: d9395f52761f143357b97530d199aeea58976868ba33cc97c0b3448ad035b678
font_01_sfnt_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 10468 bytes
SHA-256: ae421d2f8109479e4e0cc16bc08911af5b6802b66f58dff6a80c270b0ff61282

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