Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8976877ae621d19…

MALICIOUS

PDF

73.3 KB Created: 2021-02-18 13:09:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 8c43a4f66bf2ba47d2e698cd129e2e0c SHA-1: 52f52df9086af564f0b8ef404a450a470256b20c SHA-256: c8976877ae621d19252e69dc68603226aa64f435ae6139c810129baf85f512f4
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?utm_term=amplificador+de+audio+casero+100w+pdf'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for redirection or further payload delivery.

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/strik?utm_term=amplificador+de+audio+casero+100w+pdf In PDF document text
    • http://tajawuxelefa.22web.org/barcelona_song_audio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_5fe950ebea3cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_60209b56b087d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_601ebf6cacbbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_601a8ec5cf9cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458421/normal_602b2247ad07e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484605/normal_5fe8a2845ae6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421778/normal_5fcaeb971e23e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451544/normal_602afaf7f236a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_60186cbf3b825.pdfIn PDF document text
    • https://cdn.sqhk.co/pinebiven/ibRidDs/gomipeminufax.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/ig9zhgl/harvest_moon_album_neil_young_lyrics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_6004333cdb5a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_601c66e086705.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/nuxulikiwab/newotojubetenuzus.pdfIn PDF document text
    • http://mapulikilep.epizy.com/79719953222.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/9405632690.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_off0000d4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B8 5272 bytes
SHA-256: 9a89197a5fd57fd333e0c471ca0feced838adc9c0661741f5e7991cb92d086a7
font_01_sfnt_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 10384 bytes
SHA-256: 1db80a5496ec824cc31584ac2e1cfb4261b9dccb80e31608b4de2c833ce6bb14
font_02_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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