Malicious PDF — malware analysis report

Static analysis result for SHA-256 997d46507e9e0a62…

MALICIOUS

PDF

67.6 KB Created: 2021-02-12 07:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e841f6673feeb0547a1b0ffa34762abd SHA-1: cdf89c81320cab28bd123016d4ee8d096d81ff85 SHA-256: 997d46507e9e0a624a4b7928e2fad2ba55f9864c1db6863d0c1e3d734f50ace7
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded URLs, one of which, https://jacksth.ru/123?utm_term=crossing+over+and+gene+mapping+worksheet, is flagged as an external URI. The presence of these URLs suggests the document is designed to redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure and embedded URLs are strong indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/123?utm_term=crossing+over+and+gene+mapping+worksheet PDF link annotation
    • https://cdn.sqhk.co/rajemaramiw/gX2Dicw/opening_to_tiny_planets_dvd.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/Xhgt8di/42656783207.pdfIn PDF document text
    • https://cdn.sqhk.co/fusevesapime/VDjesgf/kafuwej.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/Phbhau2/dodge_dart_rallye_engine.pdfIn PDF document text
    • https://zezawimikosalef.weebly.com/uploads/1/3/5/3/135329884/tawurivitafatogefago.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/6hfKMOs/knife_throwing_competition_target.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/xamibebulosaxug/54117769622.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/navy_football_uniforms_for_army_game_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/simple_biodata_format_in_ms_word.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/nimejibamulasodenojuk.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/17175596297.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/bejeweled_popcap_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/bevuladixafogefi.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_off0000ca2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2C 5464 bytes
SHA-256: f5718df5a65f0cab7252ddb46b1e5451ae70e6e2f54d7d73eff1a0909e6cd0ab
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 10724 bytes
SHA-256: fe21b3945e1af8c61e0e0a90a852abd8ddd9370edf259eb0090bd953b1a7d195