Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6697df79e29b26…

MALICIOUS

PDF

82.1 KB Created: 2021-03-01 15:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 56c5f8b6fa9f63384de2942e964658b7 SHA-1: 770d4e61930ab945403a630b31942c7458ee56da SHA-256: 6c6697df79e29b26523ca4fbb1cf5cc925d988536d1d21a5fb20a740d9581207
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://dafemum.ru/strik?utm_term=newcomb%2527s+wildflower+guide+app'. Additionally, ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The ML classifier also flagged this PDF with a high probability of being malicious. The presence of embedded URLs and the overall structure suggest an attempt to lure the user to a malicious site, likely for phishing or malware distribution.

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://dafemum.ru/strik?utm_term=newcomb%2527s+wildflower+guide+app In PDF document text
    • http://depafelevan.22web.org/padarosagajexofodeto.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/33379691753.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/dusined/88934092072.pdfIn PDF document text
    • http://vusurides.rf.gd/zisad.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/button_element_submit_form.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/51909778362.pdfIn PDF document text
    • http://nidawijonag.rf.gd/18155240410.pdfIn PDF document text
    • http://komomikadexep.rf.gd/89837627111.pdfIn PDF document text
    • http://famirafopuremu.rf.gd/10553061035.pdfIn PDF document text
    • http://vuvabideriwewet.epizy.com/bible_verses_about_the_holy_spirit.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/38208045812.pdfIn PDF document text
    • http://zuronixo.rf.gd/38277503155.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/yummy_mummies_tv_guide.pdfIn PDF document text
    • http://midelex.epizy.com/52837474085.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_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 5408 bytes
SHA-256: 14b8c6ef37c02d0a4583cac9934c63f39d2e4b0f2c127954898067e8a47707b2
font_01_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 11128 bytes
SHA-256: ba1a71021fe62ea635909a7f39356d10fa7ef20c3817f29305c3879f7a8428df
font_02_sfnt_off00012d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5D 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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