Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0899af31ebb66d…

MALICIOUS

PDF

77.2 KB Created: 2021-02-26 00:03:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f029efc17d7ac539facdd91dc4fb91ab SHA-1: f171270607a321a663af4984bad61a058c939350 SHA-256: 4c0899af31ebb66d3387ea2398c5b16a16dfb0d039c3829850be5878420d1d02
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'. ML classification and ClamAV also flagged this PDF as malicious. The embedded URLs suggest an attempt to lure the user to a malicious site, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=what+is+the+formula+for+instantaneous+velocity In PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/5295650.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378165/normal_5fef1b59078af.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/5114746704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411935/normal_5fe12af78c7d0.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/313994084.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/lotus_caravans_for_sale_qld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483362/normal_600f5e0d1dc57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_6020c1202e6e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_600bb90dcf8ec.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/59893814075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427509/normal_5ff29680f36a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481166/normal_5ff64a6be4b0d.pdfIn PDF document text
    • https://kapelasijad.weebly.com/uploads/1/3/4/3/134312752/886204.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/kasemiw.pdfIn PDF document text
    • https://sorasewemo.weebly.com/uploads/1/3/4/3/134358680/ledivigegutawusek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_6000da7016a89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pigutun.myartsonline.com/outdoor_keyless_pin_code_door_lock.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/do_the_work_steven_pressfield_audiobook_free.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_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 5296 bytes
SHA-256: 121031b300441f68969c85f74064c0a4fdb34d5ce1ecbce58ec5156d04539bc4
font_01_sfnt_off00010104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 11032 bytes
SHA-256: 004e81a6812dfca4cbd07a69d72492b38ff3879fe051b744652fc2f60ca91e65

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