Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d58a7268e7bc4f…

MALICIOUS

PDF

68.6 KB Created: 2021-01-16 15:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8973040f4965fb90e3cea6a7a4a9f072 SHA-1: 7420190fa42253e4a7c300a22e21d72c45db055f SHA-256: 19d58a7268e7bc4fdeb34ec6478207955fe8f90a26ca92663599e0a5d3ada0df
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least two identified as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=gravity+falls+memes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f86fbc9b919b.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/cgdhbku/jumewikoduj.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/gfamgiP/business_english_board_game.pdfIn PDF document text
    • https://kafememum.weebly.com/uploads/1/3/4/6/134616831/dunovi.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/ja1oCdS/45128799367.pdfIn PDF document text
    • https://cdn.sqhk.co/likamigid/aXgdMVW/the_sims_mobile_mod_apk_unlimited_simcash.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/s1IieWs/galaxy_star_shooting_apk.pdfIn PDF document text
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/kudewulixoz-gizurilebeguva.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/3jehe6p/50101266461.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/vokonojujijobe.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/james_bond_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/tutorial_basico_de_excel_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/addison_group_work_consultants_submit_timesheet.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_off0000ca9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9B 5108 bytes
SHA-256: b84f7e0494d6ead7175673846c6a53996fced9c53e2b8edd6d01272ea064918b
font_01_sfnt_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 12748 bytes
SHA-256: 83f435a09ca89549ed0b23e0d7cc72a73fc876f135770da379e9066d62e9987d

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