Malicious PDF — malware analysis report

Static analysis result for SHA-256 a953a187e95498d1…

MALICIOUS

PDF

98.8 KB Created: 2021-04-04 18:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed81620cc3d2910bc242a13aa6469478 SHA-1: 460dc414729301a75d73da2b82197a621b0ffdc5 SHA-256: a953a187e95498d19ad5d7714239b3b218aab929c18339751c5bd1f5ee499c47
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://botokaw.ru/strik?utm_term=how+to+mix+voice+logic+pro+x. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+to+mix+voice+logic+pro+x
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/a461008cc140dd.pdf
    • https://cdn.sqhk.co/pafevola/iigRWje/video_for_likee_tik_tok_trending_2020.pdf
    • https://cdn.sqhk.co/fosuzonarefi/cjfifjh/75876270341.pdf
    • http://instacopyrighthelpteam.com/gimezagezuwijfq0e.pdf
    • https://gatokoliza.weebly.com/uploads/1/3/0/7/130739470/zebikogina.pdf
    • http://hesap-al-sat.com/the_yearling_book_for_sale1tggi.pdf
    • https://cdn.sqhk.co/firimubujosu/Vgcgegi/xisilakeduxerokof.pdf
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/5908492.pdf
    • https://varanikugeju.weebly.com/uploads/1/3/4/6/134640125/ribuginudu.pdf
    • http://look-hotel.com/how_do_you_change_the_ink_cartridge_on_a_canona3frs.pdf
    • http://formulamoney.top/52494596775t3bga.pdf
    • https://cdn.sqhk.co/papusabefo/ha3ujbA/94281320690.pdf
    • https://nuwevalixur.weebly.com/uploads/1/3/5/9/135990129/9245774.pdf
    • https://vipefujalebir.weebly.com/uploads/1/3/4/7/134744486/9579610.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_abd6fcce24df4237948cde80ce47fc6f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/80238e28-7e86-4576-a96d-c5dbda17563f/which_verbs_are_irregular.pdf
    • https://uploads.strikinglycdn.com/files/7afad0d7-8972-49f2-8b56-bb47bc386350/15479421734.pdf
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_d4ae7ec116bf45dc928500968bdebb2a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dcfff31a-b5a1-40a0-9f9f-f02df08b82a8/panasonic_27l_inverter_microwave_oven_-_nn-sf574sqpq.pdf
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_09ac795535054a8191685d75674a2c0a.pdf?index=true
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_a3020c5a7eb240158129f1e7963623c7.pdf?index=true
    • 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_off000148cf.bin
02692bf28ef4259d2903ae2309a6699e30e2b82abf9d03aeda448270f41a96b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148CF 5044 bytes
font_01_sfnt_off00015a02.bin
6951c981c4209b827e49a2dbb12feb3369c22c56467ce2011281ec7748374120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A02 10852 bytes

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