Malicious PDF — malware analysis report

Static analysis result for SHA-256 829b9dc999ea5e7e…

MALICIOUS

PDF

76.4 KB Created: 2021-02-22 23:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41f46eef04c10e3fab259fc633c08f8f SHA-1: e8c1ac29876dd0ccf6c57c66384e4cbb6deb6d39 SHA-256: 829b9dc999ea5e7e725ab832c0d2529b467d96103b5527a770bb9f7536311456
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a password archive lure heuristic further supports the idea that this document is designed to trick users into downloading and decrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/wix?keyword=avg+internet+security+2018+key+till+2020
    • https://cdn.sqhk.co/xivovido/eFifUij/53952931908.pdf
    • https://cdn.sqhk.co/mikedeto/hqrdk2e/63374536794.pdf
    • https://cdn.sqhk.co/vefoveted/hhieXhd/digital_marketing_plan_template_excel.pdf
    • https://cdn.sqhk.co/fofasafiwi/jbAheTh/89288218799.pdf
    • https://cdn.sqhk.co/rizijuwet/ji8Nibs/5681770687.pdf
    • https://cdn.sqhk.co/wusuzevomo/D3hgVif/snake_in_the_grass_meaning_in_urdu.pdf
    • https://xofezariro.weebly.com/uploads/1/3/1/8/131871505/fubatejepora.pdf
    • https://cdn.sqhk.co/foroboreb/fhdRhi8/86186221834.pdf
    • https://cdn.sqhk.co/tatidukigag/jehbggh/rocket_craze_3d.pdf
    • https://cdn.sqhk.co/kagelemovo/hom7hjW/splash_lagoon_food_prices.pdf
    • https://tedipoji.weebly.com/uploads/1/3/1/4/131408178/wixow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kapivuvarebe.rf.gd/bhakti_song_dj_2019.pdf
    • https://s3.amazonaws.com/mefovu/netflix_app_for_windows_pc.pdf
    • https://s3.amazonaws.com/muxegeza/41905095794.pdf
    • https://s3.amazonaws.com/mexavofezoxi/castle_crush_mod_apk_unlimited_gems.pdf
    • http://jelelonu.rf.gd/2d_geometry_worksheets_grade_6.pdf
    • http://jiwuwusa.epizy.com/jabadagupajawakine.pdf
    • http://begosene.epizy.com/48966746445.pdf
    • http://zuluvegutadetu.epizy.com/41917777420.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_off0000ed0a.bin
6bdee2c9d7c729161f2f6b4c0afebea483ea67de4518077bff09b19333a0f543		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 5492 bytes
font_01_sfnt_off0000fff8.bin
a1bce1a8eccd8680bc29484faf41baf714a2a9cecf315fb712ca82408760868f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 10532 bytes

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