Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf717f429f6f31f…

MALICIOUS

PDF

74.1 KB Created: 2021-03-01 19:05:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 14312fe81a4fd129bf6554979bad7bd1 SHA-1: 497e0c02adfb585966b54bd3fd73e6f71d83c7aa SHA-256: ccf717f429f6f31f2b687cc14c74a4ad8b51dc73cc6356425fe250cb629bfb2f
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'gimoguvi.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, aligning with common social engineering tactics. No scripts were extracted, but the presence of external URIs and the overall malicious verdict strongly indicate an attempt to redirect the user to a harmful resource.

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://gimoguvi.ru/wix?keyword=balancing+equations+and+types+of+reactions+worksheet+answer+key PDF link annotation
    • http://bewizasosu.sportsontheweb.net/how_to_use_oracal_651_on_silhouette.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/human_resource_management_gary_dessler_ppt.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/nuxomigo/voucher_format_in_word_file.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/72323331828.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/64292618157.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/movie_apocalypse_now_1979.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/health_promotion_practice_author_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/color_wheel_activity_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/64061370024.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/king_size_bed_sheets_egyptian_cotton.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/luxigigofegofotabufujot.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/jakagoji.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/totumizefowoxotalum.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/dojovoxibudubifemorese.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/fm18_scouting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/91845009191.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/power_air_fryer_oven_cookbook.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_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 5852 bytes
SHA-256: 2f51feddb5386afab947dc45ebf332c63d75659c5fe45c202cd15ab687e4edd9
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 10252 bytes
SHA-256: c78c6c663602f06657cb96b94219cb534883a5e6b11544a12d67305164caad54

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