Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ca3e24c377a39c…

MALICIOUS

PDF

92.9 KB Created: 2021-02-13 16:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f6b16089816441922a140446f33be006 SHA-1: 5192b0e43e8f035cf38fc2718a1389f4766541d3 SHA-256: 77ca3e24c377a39ca08f7a3e9382be85c3a9f9d1d77845e6ab92b1c49461114a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were extracted, the presence of external URIs and the ML classifier's high confidence score support the classification of this PDF as malicious, likely serving as a lure to external malicious content.

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
  • 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://seumenha.ru/wix?keyword=elite+dangerous+guardian+tech PDF link annotation
    • http://badge-verification-center.com/37895535218h5oj3.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/LXgh0jc/vigek.pdfIn PDF document text
    • http://uplrezina.site/722879249657713o.pdfIn PDF document text
    • http://bellissimo.online/jogutegidemonijic33h.pdfIn PDF document text
    • http://reduslimitalia-official.site/weezer_africa_albumzskz9.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/principles_of_corporate_finance1o1b0.pdfIn PDF document text
    • http://mesretly.xyz/arabic_keyboard_for_windows_xp_freefnz9w.pdfIn PDF document text
    • http://domastmsk.space/archero_guide_holy_touchzsm6e.pdfIn PDF document text
    • http://fibilif.iblogger.org/mutual_agreement_employment_termination_template.pdfIn PDF document text
    • http://erogan-oficial.site/classroom_solutions_grade_7-_9_teachers_guidezgkdm.pdfIn PDF document text
    • http://habercigo.com/88735378733852mv.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/i4iJygd/college_football_championship_history_winners_and_losers.pdfIn PDF document text
    • https://cdn.sqhk.co/xijoxerivu/gc6hfy7/merchant_marine_ww2_casualty_rate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://regipikiwubadov.epizy.com/chahun_main_ya_na_tone.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/balu_mahi_movie_720p.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001244b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 5040 bytes
SHA-256: 57b7209ddde2182845a180b51ecdaaa48913b9ea1b2c33aff4de60fe8634de8c
font_01_sfnt_off00013558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13558 10232 bytes
SHA-256: 2dd02dc9148ac947450a3c96e55eccb7a0a31fda3841973435e1108e6e963822
font_02_sfnt_off0001586a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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