Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6cdff979f7a1e9…

MALICIOUS

PDF

76.2 KB Created: 2021-01-21 18:37:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5afacdf08ab8ff6da3b64deef45f8b9f SHA-1: ee52dffbaf576e3a14312509acd4c745c63cb842 SHA-256: fe6cdff979f7a1e961d7915b9076f28b0a2a868e9b61205e3169eae1f004e9db
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to 'https://jacksth.ru/aws?utm_term=reason+for+leaving+current+position+answer', suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, contains text related to job positions, which is a common lure.

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/aws?utm_term=reason+for+leaving+current+position+answer PDF link annotation
    • https://site-1194807.mozfiles.com/files/1194807/14733796003.pdfIn PDF document text
    • https://site-1179856.mozfiles.com/files/1179856/lezusapuzulawimijubesaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5ff772efd9c01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404750/normal_5fc5b4ce4f6e4.pdfIn PDF document text
    • https://site-1176840.mozfiles.com/files/1176840/94367626402.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461746/normal_6006b6f5954ec.pdfIn PDF document text
    • http://xufunuduxatene.iblogger.org/quick_heal_antivirus_for_server_free.pdfIn PDF document text
    • https://site-1188059.mozfiles.com/files/1188059/behringer_xenyx_x2222_service_manual.pdfIn PDF document text
    • https://site-1179818.mozfiles.com/files/1179818/can_t_netflix_app_windows_8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444647/normal_5ffab3d67c0f6.pdfIn PDF document text
    • https://site-1177991.mozfiles.com/files/1177991/free_card_games_online_no_required.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452850/normal_6006990d73b81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5fdae94bb8d4f.pdfIn PDF document text
    • https://site-1177725.mozfiles.com/files/1177725/50893579370.pdfIn PDF document text
    • https://site-1178040.mozfiles.com/files/1178040/66218472247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wowawese.rf.gd/9734997609.pdfIn PDF document text
    • http://sirowozikuko.epizy.com/ib_english_language_and_literature_guide_2017.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_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 5344 bytes
SHA-256: 2ea73a7d79739c40eddb8e22384598d22bc97427a168bd3b1ce37e7d3f2841a3
font_01_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 10316 bytes
SHA-256: a4d0d1630517e1a73e9e58ab4da8d556210cb090ecaf1e107c0fdeb5b2141062

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