Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6236aff877298e…

MALICIOUS

PDF

73.5 KB Created: 2021-01-24 05:16:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a573f948e464c45de080d0fdfd491ae5 SHA-1: b2f48d3f4b371dda447269f883f917cca05bb2f8 SHA-256: af6236aff877298e115b3a01dd3126541757262737d3ae57378cfb7dc2cb4ee0
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to professional development, aligning with common social engineering tactics.

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://baarspo.ru/123?utm_term=nco+professional+development+ribbon+numeral+5 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5fd9faeb9d87a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404297/normal_6002d5c593745.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/xmaiajc/foundations_early_childhood_education_center_englewood_fl.pdfIn PDF document text
    • https://site-1173985.mozfiles.com/files/1173985/hd_wallpapers_1080p_download_for_mobile_3d.pdfIn PDF document text
    • https://site-1177655.mozfiles.com/files/1177655/61475522116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402252/normal_5fe051c1677cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5fddfc4c9e9c0.pdfIn PDF document text
    • https://cdn.sqhk.co/nulogoxeja/ifHVKig/fluffy_vanilla_cake_recipe_with_buttermilk.pdfIn PDF document text
    • https://cdn.sqhk.co/vosiwuli/ojhig1I/sirocco_boat_cost.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/tikoweravisixu/pharmacology_mnemonics_antibiotics.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/sawesarodoniwezev.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/beintehaa_serial_song_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/vuxapakupigubarimefuzeta.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/22557262967.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/chakram_movie_videos_songs.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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 5596 bytes
SHA-256: db6535d995666655915452d959057afd1be72a336378bcc749d4e9109b00e4eb
font_01_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 11772 bytes
SHA-256: 83b1b90c29b4d3be3add3e31b2a0ca3d575e47ed40e9e5bc5f44c0d39ad40020

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