Malicious PDF — malware analysis report

Static analysis result for SHA-256 257a367d0a0055fe…

MALICIOUS

PDF

74.3 KB Created: 2021-02-24 01:07:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8a3017dd6f522723715d3397aa988f5 SHA-1: 722a6f5b4ec194d4443814a44d3976fa6f59263d SHA-256: 257a367d0a0055fe8e91b4da2679d7cbe2eac5ad4dbda8fd0e793ee791b12400
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a website seemingly related to 'Dahlstrom middle school rating'. This URL is likely malicious, as indicated by the ML classifier and ClamAV detection. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. No scripts were extracted, but the presence of external URLs and the overall detection suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=dahlstrom+middle+school+rating
    • https://cdn-cms.f-static.net/uploads/4503033/normal_600fe22092b5b.pdf
    • http://bettermoneytips.com/vichara_by_armaan_bedil_song5wid6.pdf
    • http://m-ryanaf.site/fadokupexasanf78al.pdf
    • http://foodguideblog.com/broadcast_journalism_books0av0q.pdf
    • https://cdn.sqhk.co/lewiwifo/hhdgiLL/toolbox_talks_templates_south_africa.pdf
    • https://cdn-cms.f-static.net/uploads/4415322/normal_60160dea74af1.pdf
    • https://cdn-cms.f-static.net/uploads/4491439/normal_601e81d71b522.pdf
    • http://magic-spring.com/jonariboe9qxh.pdf
    • https://cdn-cms.f-static.net/uploads/4413866/normal_6022e8b79f4a5.pdf
    • https://cdn-cms.f-static.net/uploads/4485010/normal_6016f7a0a290e.pdf
    • http://bandalet.club/715189127ejt.pdf
    • https://cdn.sqhk.co/gemadaruvow/5sijX1V/card_thief_upgrade_guide.pdf
    • http://usesalon.xyz/48025880844vz8qi.pdf
    • https://cdn.sqhk.co/wakewafo/iaArhdj/anime_stickers_pack_wastickerapps_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/senodiw/zeremizo.pdf
    • https://s3.amazonaws.com/kevava/noun_adjective_adverb.pdf
    • https://s3.amazonaws.com/kefiperizonofu/vorituvurowakiwejakuka.pdf
    • https://s3.amazonaws.com/satuja/puppy_dog_mask_template.pdf
    • https://s3.amazonaws.com/jojitagifuva/86441958684.pdf
    • https://s3.amazonaws.com/paxuvagal/10328973462.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db94.bin
0316bd97b64e064391e0197387ba7ac62bf810678b7751753373ff2489ef9b52
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 5352 bytes
font_01_sfnt_off0000ed9f.bin
ae28e0b8e704031180c8717fcdc6d10a95208c9e53774246d8c1d06743373158
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 14972 bytes