Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3152ee5372de5af…

MALICIOUS

PDF

66.8 KB Created: 2021-03-03 13:33:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 99799c25208f5608ec4da6848bb039c3 SHA-1: 8d1a0d41d9413de156dc5c4a162ceb77b67cad7d SHA-256: d3152ee5372de5af7e52e98e35ce4cf0d81c4d9890c8f50ceefb5fb67fe776e8
184 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8843

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/award?keyword=singapore+math+workbook+1a PDF link annotation
    • http://leadtop.co/flannelette_sheets_ebayn1cig.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/xulafipinibabise1gdw9.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/jjjaQib/50593914454.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/42589615017zn03e.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/iaKgggh/toy_super_smash_bros_apk_ios.pdfIn PDF document text
    • https://kivisazof.weebly.com/uploads/1/3/2/6/132696558/02ec5eb.pdfIn PDF document text
    • http://creamwalls.online/how_to_find_bounded_above_or_belowhk36e.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/sghznRG/dalesavuwazokujibulevo.pdfIn PDF document text
    • http://odemebayisitrafik.com/nutemabuzesofipavaxuzisaogdlm.pdfIn PDF document text
    • https://penaxixix.weebly.com/uploads/1/3/0/8/130813526/bogasajipevifox_rugug_danejiririjim_jotafut.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/icjizYD/zexawuzevosu.pdfIn PDF document text
    • https://webuwoterin.weebly.com/uploads/1/3/4/5/134589655/7806718.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/eouhajf/crackle_paint_color_samples.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kigodugenuv.rf.gd/somewhere_over_the_rainbow_trumpet_sheet_music.pdfIn PDF document text
    • http://gubazovofugofe.rf.gd/how_to_manually_drain_kenmore_front_load_washer.pdfIn 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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 5476 bytes
SHA-256: 4dbab4207d8937fb2d2128186cd99628bf888867aeee3e8623e4149d8b7f6e9c
font_01_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 10596 bytes
SHA-256: 31d365f8c52a75b4194144117e21e4d168cbd446f46f87e43b3ca2a63a067abd

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