Malicious PDF — malware analysis report

Static analysis result for SHA-256 49117754d8793bca…

MALICIOUS

PDF

76.8 KB Created: 2021-02-20 02:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a5eeba10ce81655672f2209cd89c3265 SHA-1: be7484957963bfc33fa02a2678bba92a76475459 SHA-256: 49117754d8793bca4255ce125f8be17dac10a5d3dd7277af17bf3a766d07ecf7
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain text related to legal dictionaries and application metadata, suggesting a lure to disguise the malicious links. The presence of numerous links on disposable hosting further supports a phishing or spam campaign.

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://yafferge.ru/strik?utm_term=what+does+black+mean+in+the+law+dictionary In PDF document text
    • http://kuroramogesok.iblogger.org/484860305.pdfIn PDF document text
    • http://xuridikak.22web.org/mudorobivimepa.pdfIn PDF document text
    • http://faxozulakevosos.iblogger.org/mikasa_azur_lane_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/f6XMjew/stickman_and_gun_3_hack_mod_apk.pdfIn PDF document text
    • http://tcerkovniekupola.space/hortonworks_sandbox_installation_guidedy4qr.pdfIn PDF document text
    • https://cdn.sqhk.co/fifotadog/cjgUhgh/army_list_builder_wh40k.pdfIn PDF document text
    • http://mnatural.space/america_s_got_talent_2018_videos4pvjl.pdfIn PDF document text
    • http://zenafek.iblogger.org/book_of_genesis_bible_quiz.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/ihhbifB/oscar_de_la_hoya_vs_mayweather_2.pdfIn PDF document text
    • http://believes.space/deutscher_schauspieler_das_wunder_von_bernrbda8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xugeseza.epizy.com/vuxego.pdfIn PDF document text
    • http://pibasas.epizy.com/free_music_cd_covers.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/enthralling_performance_bard.pdfIn PDF document text
    • http://nupifikitove.epizy.com/cover_letter_template_for_pages_mac.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_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 5592 bytes
SHA-256: 315f7f3886d1256b37c70441a00f6cae7eaaf9c2eb7a79bec47b3919432d652d
font_01_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 12164 bytes
SHA-256: 3dbfac5d5a966ca31befe42efbe7461cf0d0e2736f1181243193a4691d746b0d

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