Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f5b5323b4ebacd…

MALICIOUS

PDF

71.6 KB Created: 2021-01-25 22:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1a56a1a25f7ee5248237ec6f04b01155 SHA-1: e112a6272d525ad05bafa7855992342c2270055d SHA-256: 77f5b5323b4ebacd49197b48422e35eb1f2b4983c742dd52f3f5e09c6541da85
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and a high ML score for maliciousness. It contains numerous external URLs, with one pointing to 'trafftec.ru', suggesting a phishing or malicious redirection attempt. The presence of embedded URLs and the ClamAV detection further support its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://trafftec.ru/123?utm_term=in+the+heat+of+the+night+tv+show+actors PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409095/normal_5fcd6a0468a7a.pdfIn PDF document text
    • http://hr-insider.com/chhota_bheem_pirate_attack_gamenw4f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_6000adbdd3dbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408990/normal_5ffc20efdb175.pdfIn PDF document text
    • http://heartcenteredequestrian.com/best_shooters_of_all_time_ps494h3p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471706/normal_5fef1239ee6fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5ff09a4e59cb6.pdfIn PDF document text
    • https://furivupes.weebly.com/uploads/1/3/5/2/135295821/nokuvi-rubusopixatijez-bivuxututex.pdfIn PDF document text
    • https://paboripiniw.weebly.com/uploads/1/3/0/7/130739049/05a8f2292d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/emmental_cheese_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/aiag_spc_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/45573314148.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/gta_vice_city_cheats_helicopter_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/periodic_system_of_elements.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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 5200 bytes
SHA-256: 0f932cd35ec00b4ae804789c9ab6f5d74b225d222300d366f0855c658d532722
font_01_sfnt_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 10644 bytes
SHA-256: 1611d6c0f6ea6646a900b632ddf1aba50015f170a2e7adaaf8d78b28b637f98a

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