Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cb408520ff01ae…

MALICIOUS

PDF

78.5 KB Created: 2021-02-05 09:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cec9b05c1b82d3ba75be58c377d6df6f SHA-1: b7aa633d69b41f58ce0705bbe0029613665d5d06 SHA-256: 69cb408520ff01ae011c5a5eaf63282711ee3ccbc9ad46b6ed5fc90b7baef4c4
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'https://jacksth.ru/123?utm_term=ribeye+steak+calories+cooked', which is a strong indicator of a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of the external URI and the ClamAV detection strongly suggest a malicious intent to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/123?utm_term=ribeye+steak+calories+cooked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453142/normal_601419d2118af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451750/normal_5fc993f82ca40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409110/normal_6003b6ed77bde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5fe79d792623f.pdfIn PDF document text
    • http://ighelperscenter.com/ejercicios_resueltos_economia_4_eso6gtoa.pdfIn PDF document text
    • http://dvertsoff.ru/performance_parts_for_classic_carsw57rn.pdfIn PDF document text
    • http://apsdd54gfv.xyz/ace_gangster_taxi_hacked_unblockedgwcxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476453/normal_5fec219f1fa5a.pdfIn PDF document text
    • http://tgesheff.xyz/facebook_logo_font_namem248a.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/kisagoz/avengers_endgame_4k_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/bagri_nagar_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/hp_validity_sensor_driver_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/vomuxiropajat.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/relieving_letter_format_in_word_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/12935411923.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/advanced_mathematical_decision_making_2017_answer_key.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_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 5244 bytes
SHA-256: 30a92bc6aad6c566ea91f06ab2a1a6f7c37df9286997b00a59921eb0d525db22
font_01_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 10888 bytes
SHA-256: 479a33774e54344576acc57eb78a4fcff99d6c84e232e7b5f03ebb9ccc30c54b

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