Malicious PDF — malware analysis report

Static analysis result for SHA-256 d957217c094ef5cc…

MALICIOUS

PDF

153.7 KB Created: 2021-01-14 16:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: baab46e75d18d76d19e54abd8a217168 SHA-1: ff2e27b49b4e9cebf7986966461c8b0b0ef73cef SHA-256: d957217c094ef5ccb278d280def10d5b40b7fd0070d9368282e0345f9053e836
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to games, aiming to trick users into visiting the malicious URL. No scripts were extracted, but the presence of malicious links is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cctraff.ru/wb?keyword=1%20million%20games%202020%20collections In PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/lirodujub.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/ehbczid/money_buster_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mifimafonuku/VhhGyjd/powerboat_racing_3d_mod_apk_home.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/7503667623f507a.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/NgjMhf0/tienda_movistar_el_salvador_celulares.pdfIn PDF document text
    • https://gitilavoviko.weebly.com/uploads/1/3/4/5/134586482/kemetariwi.pdfIn PDF document text
    • https://tosopolugo.weebly.com/uploads/1/3/4/4/134440872/sududapemom_koker_retonoja_xenegej.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/b7hfwzp/43402514266.pdfIn PDF document text
    • https://tebadigizowi.weebly.com/uploads/1/3/4/1/134109241/6865584.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/wapabefizosumi/ficha_tecnica_avanza_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/organic_chemistry_unit_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/zosowesokaxesen.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00022103.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x22103 31144 bytes
SHA-256: 191cad8e20a94162fabc60ece02e0f5ba8c5c0559e8c05565e67624cf6ea0e25
font_00_sfnt_off0001bb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB29 12280 bytes
SHA-256: 1bb969518662aa0b72ee8dac009761d839db1bf9e3f3446cff57141ef273c3c9
font_01_sfnt_off0001e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3A1 5256 bytes
SHA-256: 7a7677204ac56621030b748f7d74b13acd66720a511f261df77abfa2be72dabe
font_02_sfnt_off0001f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F571 12888 bytes
SHA-256: b676308fc35f6c27467cd0b8294fd7b4471f40b1eaf6873793d6faf738b33b73

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