Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e511b4b70b9a71d…

MALICIOUS

PDF

82.7 KB Created: 2021-02-17 07:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9c8c91c327a6ee41b1da4cfea9b46aa2 SHA-1: d4f307c1519499430201200300486a9aeec5279e SHA-256: 3e511b4b70b9a71ded803426ed292eacee4e718fdf7e8842f6cf3e114b390509
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=how+to+lock+a+chest+in+minecraft+1.15'. This URL is presented within the document body, suggesting a phishing or social engineering lure. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the presence of a malicious URL is sufficient to classify the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/wix?keyword=how+to+lock+a+chest+in+minecraft+1.15 In PDF document text
    • https://cdn.sqhk.co/luwivimexu/cFidjgh/tom_and_jerry_movie_2021_wiki.pdfIn PDF document text
    • http://zoziwasikow.22web.org/tibbo_aggregate_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/fJcJhck/50212662719.pdfIn PDF document text
    • https://cdn.sqhk.co/nesorosuxim/eh6ifif/caricare_stickers_su_telegram.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/F3jajb3/download_wild_crocodile_simulator_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimoxifagi/hRgfShe/asteroid_crashing_into_earth_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lagexodefajo/ijczChj/download_my_u_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/bu7jiOB/rome_total_war_barbarian_invasion_factions_units.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/mid4gjf/xuzam.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/gekojulog/pozaninixugewemosu.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/wedding_dress_styles_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/12397962440.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/mergers_and_acquisitions_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/crossword_answer_for_excessively_sentimental.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/mawatokarazasoli.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/bajisag.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 5444 bytes
SHA-256: f343012bd96bf4fbac04c76c4d1a490d13b94ce98c1c929022d7ecfea8e5da05
font_01_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 10080 bytes
SHA-256: 1ccd11ea25b4f58d1f4af3552f1c24a66b9b621d678e0ef12a544cf9f28aa7ee
font_02_sfnt_off00012869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 16104 bytes
SHA-256: c72ca0970d51b0a8ad78cefeb5ce5696832e14da31bd2128a4ba9c3d04a16bf4

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