Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3574574eec11e3b…

MALICIOUS

PDF

62.6 KB Created: 2021-01-17 14:31:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9af636b74e8554d1b61c555bc11baf21 SHA-1: e883e1a82bb4d8959f7d4aa96c972a054d91fc6c SHA-256: a3574574eec11e3b3d5ffbaa921f72c7f0155049dfb285c5f0e5cac03527b1d3
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to lure users to malicious sites. No scripts were extracted from this sample.

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://cctraff.ru/aws?utm_term=bal+hanuman+hd+images In PDF document text
    • https://cdn.sqhk.co/tubafejog/bigwKik/spelling_test_online_free_for_adults.pdfIn PDF document text
    • https://site-1178468.mozfiles.com/files/1178468/xoweteworivirotipo.pdfIn PDF document text
    • https://site-1171133.mozfiles.com/files/1171133/1088849741.pdfIn PDF document text
    • https://site-1175937.mozfiles.com/files/1175937/gapuvezuba.pdfIn PDF document text
    • https://site-1178876.mozfiles.com/files/1178876/business_development_strategies_for_consulting_firms.pdfIn PDF document text
    • https://site-1182802.mozfiles.com/files/1182802/special_operations_forces_army.pdfIn PDF document text
    • https://cdn.sqhk.co/nunemiziku/diipjgj/too_many_birds_discord.pdfIn PDF document text
    • http://kopavavabigi.66ghz.com/haulotte_compact_12_spec_sheet.pdfIn PDF document text
    • https://site-1167926.mozfiles.com/files/1167926/cosmic_showdown_hack_download.pdfIn PDF document text
    • https://site-1175916.mozfiles.com/files/1175916/adjectives_worksheets_with_answer_key.pdfIn PDF document text
    • https://pepusaneped.weebly.com/uploads/1/3/4/5/134503703/3740742.pdfIn PDF document text
    • https://site-1171899.mozfiles.com/files/1171899/wow_wotlk_blacksmithing_leveling_guide_1-_450.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/MIie3je/97377818569.pdfIn PDF document text
    • https://site-1225538.mozfiles.com/files/1225538/bass_pro_shop_springfield_missouri_address.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvewukabiwetu.epizy.com/18112253373.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_off0000ba51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA51 5192 bytes
SHA-256: 7ab2f981480e519f2149f5d36047fda2cf1209184e023848949cd660e9a5e743
font_01_sfnt_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 9960 bytes
SHA-256: 647082e62a571982a30c1e9abd52e60bd48c93da1276d45fba84e55ba4fdf01a

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