Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c221f5b4384a748…

MALICIOUS

PDF

100.9 KB Created: 2021-03-16 09:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52e8514e631ea6f75246f11ae66f296d SHA-1: 9903f31ef0a125be64ed064145f0e7c3d87d1755 SHA-256: 3c221f5b4384a7485cd4360fb129a4ff47dfbd64f26c83802a6854b88d4bbc54
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards malicious content designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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-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://maypoin.ru/wix?keyword=a+guide+to+confident+living+by+norman+vincent+peale
    • https://cdn.sqhk.co/dasotipamu/ja0Cnfi/podekibabutitadimutesifu.pdf
    • https://cdn.sqhk.co/matikefateri/cjdeS5m/nanunajowudu.pdf
    • https://cdn.sqhk.co/rixutixim/bOMkRgU/94141970488.pdf
    • https://cdn.sqhk.co/xejudawadoni/2jcgcgd/43016119934.pdf
    • https://cdn.sqhk.co/juxerawabuf/UO3PKtI/swather_for_sale.pdf
    • https://static.s123-cdn-static.com/uploads/4413701/normal_5fed2bfa90480.pdf
    • http://migerov.xyz/pokemon_y_iv_breeding_guide5uojn.pdf
    • https://cdn-cms.f-static.net/uploads/4425760/normal_6032a1510c357.pdf
    • http://pokupka.space/dolce_amore_theme_song_lyrics6plcc.pdf
    • https://cdn.sqhk.co/pifizumux/kjd4Ck6/69731185419.pdf
    • https://cdn-cms.f-static.net/uploads/4406228/normal_600e400a1a039.pdf
    • https://static.s123-cdn-static.com/uploads/4366630/normal_5fc867c354f09.pdf
    • http://idealica-italiaufficiale.website/disidupabub8t4gk.pdf
    • https://cdn-cms.f-static.net/uploads/4404123/normal_5fdc4208f361f.pdf
    • https://cdn.sqhk.co/runenuti/iahaorN/pixexebegizufaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_bb673b9bb72648de8aa9b82eacfad7ea.pdf?index=true
    • https://s3.amazonaws.com/zunaporam/punjabi_badmashi_status.pdf
    • https://s3.amazonaws.com/gozifep/29413086286.pdf
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_258fd6477b184424ad820cd8fa9253ec.pdf?index=true
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_4f14b51510b74b329f1377fe24be1873.pdf?index=true
    • https://s3.amazonaws.com/xijuxosisomuna/kingdom_rush_origins_level_guide.pdf
    • https://s3.amazonaws.com/waxapoz/lathe_table_leg_template.pdf
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_9250b286b5054bc68576c5b40ffca169.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e04.bin
19a7cbea4da8af293a3362f82e1865064ddfd7860e9a671b8e8964f4a13d0ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 5588 bytes
font_01_sfnt_off000140f9.bin
4124f772d75de2e757d66273de45ab67d1472cce93aafc68bf24d7cdb8923c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140F9 1964 bytes
font_02_sfnt_off00014a52.bin
ddf8d1f694fbe4ecce37d969985bc912a495c71662bbfe890ddc756e27a3d37b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A52 11076 bytes
font_03_sfnt_off00017049.bin
9c47a8ecf7103172530608de19fa11afb8a035ab51042e9cb8c6809f09ebb189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17049 16344 bytes

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