Malicious PDF — malware analysis report

Static analysis result for SHA-256 e405216737cf1946…

MALICIOUS

PDF

86.5 KB Created: 2021-05-23 12:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 79910e3642840dee9fc7995ea2b7bdb9 SHA-1: 2c9e65d53827aafeada6020b63210401be55bc09 SHA-256: e405216737cf19462f2f97cb6efee1a4f68ecb76b972069ae06890e655bd203c
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/strik'. This URL is likely used to redirect the user to a phishing page or to download a secondary payload. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL in a PDF document is a strong indicator of a phishing or malware delivery attempt, consistent with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=advanced+java+multiple+choice+questions+and+answers+pdf+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_602fa3a1b35a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483608/normal_60145734b2b8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450242/normal_600e405768496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_60229c9ab4154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_60393e1832f57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_6025f484405c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_6012eaf41d94c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389792/normal_6060981e4c314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404122/normal_606b487cad86e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_606b275121879.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
    • https://s3.amazonaws.com/lonozote/free_willy_cast_then.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbcc6827-78a0-4219-b7d6-b2cd5b87e30e/what_size_is_20_x_30_cm.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/geresoxetikonagajoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53229bb-f134-49e9-b00a-193b03ba473d/girl_scout_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/what_are_the_essential_elements_of_a_map.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/run_on_sentence_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/avolites_pearl_2008_service_manual.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_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 5620 bytes
SHA-256: d8eedcf1e03f0ea8e7009f7d06d11ab84f43b49bdb5ceeade90aafe47c98b0bf
font_01_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 12292 bytes
SHA-256: 5525aa6b917d4bac8ea9326eb03a467999311d3b324d43e6bf632aa84216f58e
font_02_sfnt_off00013dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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