Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e6dcff4266f193…

MALICIOUS

PDF

77.2 KB Created: 2020-12-27 05:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7da3c809be28bc75726cefedcbaaabce SHA-1: 535c259f6856433a67c13e2246e919cfcea236b6 SHA-256: f4e6dcff4266f193b17389a7f74ee86ef36b726428941b20d395e445064a726b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'business development' and the wkhtmltopdf tool, hinting at a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?utm_term=tout+sur+le+business+development
    • https://cdn-cms.f-static.net/uploads/4379970/normal_5fd711b743b06.pdf
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fc698a4efd85.pdf
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/dafexi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gupuso/46431076031.pdf
    • https://s3.amazonaws.com/rizijubovapuk/xuvofafulawatefibi.pdf
    • https://s3.amazonaws.com/fizaxo/xaxubuda.pdf
    • https://s3.amazonaws.com/sebunuzu/79319989319.pdf
    • https://s3.amazonaws.com/zazelujeju/bloodborne_trophy_guide_old_hunters.pdf
    • https://s3.amazonaws.com/pafiganovavi/24792725547.pdf
    • https://s3.amazonaws.com/nisoxow/water_under_the_bridge.pdf
    • https://s3.amazonaws.com/litunux/answer_to_a_problem_crossword_clue.pdf
    • https://s3.amazonaws.com/kobivimelelo/avast_antivirus_free_for_cell_phone.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c9.bin
2c96580c26f217ef3b5358ed5fdb05a68a5a03601d96614d1eb7c81887955c67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 5044 bytes
font_01_sfnt_off000102dd.bin
5658401872f4d91c60f6c681b397c5a2bfbb3312b173e3dfcc6c82abee69ee1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 10984 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.