Malicious PDF — malware analysis report

Static analysis result for SHA-256 630f93e24e576b5f…

MALICIOUS

PDF

124.8 KB Created: 2021-03-24 21:28:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1ba70a3341dbbed490cfed0c7093300e SHA-1: cc48dc4642dc4c224bd68dcd9fad8e3524b34757 SHA-256: 630f93e24e576b5f86cc3beef18c57362622f58e6050de409c28593f5054f36b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirectors, indicating a link farm or phishing attempt. Heuristics like PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest malicious intent. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the nature of the links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/strik?utm_term=trouble+obsessionnel+compulsif+exemple In PDF document text
    • https://cdn.sqhk.co/lerapuraroke/j3lbhjB/snes_controller_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/Wid9ihV/69146520169.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/FJT4iib/65315240749.pdfIn PDF document text
    • https://cdn.sqhk.co/rurizibaxami/0ij0jys/android_emoji_symbol_meanings.pdfIn PDF document text
    • https://cdn.sqhk.co/jipazebej/jvZEihO/vegiwewisogol.pdfIn PDF document text
    • https://cdn.sqhk.co/lazodadevab/iajhzwH/lenusositewoso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_56d508c6b5834bb9a3cd128ad2265312.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_4f4ff923ec1e42d0b6199def6c840bde.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_e3ea234866e94e1381458eb344b7449e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d759251b-3240-4c60-b4ab-d0432ec57d1e/67954453425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a351e63-ed90-43b3-addc-68a4c21e3d70/islamic_names_meaning_in_urdu_book_girl.pdfIn PDF document text
    • https://034b020c-baab-45d1-b3ff-c950d21f9178.filesusr.com/ugd/3c93bc_1a225b7521f1475bb88b272fcbd9ca17.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_6a1be439fb1b46879a983a52911880be.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_6ad7f2c7ede544c29da60ba8e28022c0.pdf?index=trueIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_2ff0acb565b949bb950d2c32283ee531.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_d4348a82521042e9b961229d2f46486a.pdf?index=trueIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_df82b4a2d45b48caaeac6bbc71fd0314.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5db2ded-ea8d-4a18-8803-f76cf97d3083/motodikawerulorugekoxi.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_718f2559fc204cd9a07b428a65639062.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_b36a9a3b54724fab8d3a04ff9ca3095e.pdf?index=trueIn 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_off0001a00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A00A 5108 bytes
SHA-256: c7eb69c83e2230b724ac763c0819970b01aa7254bc3a744643c80618316f24dc
font_01_sfnt_off0001b15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B15B 16748 bytes
SHA-256: 5f2dd2c752a8aac79702c0c1ff59ce55efa196915992f9f775ab931ddf04d0c6

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