Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c38c79d8edc2f66…

MALICIOUS

PDF

92.5 KB Created: 2021-04-11 22:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a78098c515cf717cf8144119c634929a SHA-1: 7b4cbd5e8a67eab5ad60bfa6faf4dc712712f1b3 SHA-256: 0c38c79d8edc2f6616442cf33e484b2d6b1134500be365d7a000fe3fcabd9c78
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a likely attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=garmin+62s+software
    • https://nobasaxekomu.weebly.com/uploads/1/3/5/3/135322761/1680607.pdf
    • http://rerikadarax.iblogger.org/wumegujo.pdf
    • http://vitedotom.iblogger.org/teachers_day_speech_in_telugu.pdf
    • http://gojemozuj.22web.org/13810801101.pdf
    • https://baraxuworasexe.weebly.com/uploads/1/3/4/6/134633060/2760589.pdf
    • http://xinupavob.iblogger.org/descargar_messenger_lite_apkhere.pdf
    • http://duvifabagepusu.22web.org/kanutudenetak.pdf
    • https://venunuwaxel.weebly.com/uploads/1/3/2/7/132740799/gesomagavuva.pdf
    • https://pebuzifidam.weebly.com/uploads/1/3/2/8/132815752/05aede492ef7ab.pdf
    • https://mufixedak.weebly.com/uploads/1/3/4/6/134602267/zezaromobujebaje.pdf
    • http://tedamowajowiw.22web.org/6th_grade_science_comprehension_worksheets.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sufutogikid.rf.gd/rogue_character_sheet_5e.pdf
    • https://s3.amazonaws.com/gomakobez/80137307557.pdf
    • https://s3.amazonaws.com/begijufadi/how_to_make_a_vector_brush_in_procreate.pdf
    • https://s3.amazonaws.com/xujitezu/fender_fuse_mac_big_sur.pdf
    • http://bavubuseji.epizy.com/71384150471.pdf
    • https://s3.amazonaws.com/daxemo/sikusab.pdf
    • http://wobowix.rf.gd/wrist_arom_exercises.pdf
    • http://ruredat.rf.gd/business_law_13th_edition.pdf
    • http://lafeseg.rf.gd/78097185071.pdf
    • https://s3.amazonaws.com/jolunenafobuw/14343702633.pdf
    • http://bezopiwuzalobit.rf.gd/vunujibatupaxidop.pdf
    • https://s3.amazonaws.com/xebuvuwov/tumexidekaxexozijizowaza.pdf
    • https://s3.amazonaws.com/pugomonapoxuxe/college_algebra_and_trigonometry_7th_edition_answers.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_off00012cc5.bin
7a18f94e47c142797ac67cd0f9e939fc3edf1cf37ea92d771f81665ea7dcbdcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 5292 bytes
font_01_sfnt_off00013ec0.bin
1d5f7c2b5e2f10ffe003858842990525e0f39296a160eae6d1c666e88bf0dbc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC0 11080 bytes

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