Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b74b3dde330d0c…

MALICIOUS

PDF

74.7 KB Created: 2021-06-12 05:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2675e766a1f92c6453942f704a958300 SHA-1: 5361b15ad29b2fc50bc657c4587be3d14d43c03d SHA-256: e4b74b3dde330d0ce5f0db2063b9d6bd540098537457b58e77176d2f92d0e8d0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to book-related content, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/pbw?utm_term=class+10+social+science+golden+guide+pdf
    • https://cdn-cms.f-static.net/uploads/4403824/normal_60c0973b7352b.pdf
    • https://cdn-cms.f-static.net/uploads/4494673/normal_601f62e8ac1a1.pdf
    • https://terigemi.weebly.com/uploads/1/3/1/8/131856376/kuvigozo_ximodosozigax_mevekekazibato.pdf
    • https://cdn-cms.f-static.net/uploads/4452837/normal_5fd770e764f6e.pdf
    • https://cdn-cms.f-static.net/uploads/4408719/normal_60360fdf5bbf0.pdf
    • https://fujidefabez.weebly.com/uploads/1/3/4/5/134512048/4173535.pdf
    • https://cdn-cms.f-static.net/uploads/4471960/normal_5fd66126b41e3.pdf
    • https://cdn-cms.f-static.net/uploads/4502817/normal_605b886d748e3.pdf
    • https://gerudupox.weebly.com/uploads/1/3/2/7/132712596/4358439.pdf
    • https://static.s123-cdn-static.com/uploads/4387931/normal_5ff633d5456fa.pdf
    • https://cdn-cms.f-static.net/uploads/4460243/normal_601b507d630bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5c388678-9091-4355-ba59-77b48bbabab0/the_mixed_up_files_of_mrs_basil_e_frankweiler_audiobook.pdf
    • http://jelobekow.pbworks.com/f/damon_ps2_pro_version.pdf
    • https://uploads.strikinglycdn.com/files/534d18fa-d71c-4220-b0f3-be9949a73202/18272920968.pdf
    • https://uploads.strikinglycdn.com/files/f5329226-a27d-454f-b69e-0ec7fb53c3e6/dd_wizard_magic_schools.pdf
    • https://uploads.strikinglycdn.com/files/bf3c2687-295e-4aaf-acbf-f621c7a52416/how_to_do_watercolor_techniques.pdf
    • https://uploads.strikinglycdn.com/files/6782ff2e-1df1-47a1-b20e-f63d58e4023d/55954313122.pdf
    • http://dusozivelas.pbworks.com/f/the_secret_history_of_us.pdf
    • http://luwosotatex.pbworks.com/f/38283607391.pdf
    • https://uploads.strikinglycdn.com/files/b5710122-7927-47ee-9272-be76ece38f6e/69587050211.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_off0000e680.bin
df6e5e53a7cc42088d5e0bb3ed06975cb8dd9f9259f2d2fc08c6389074cb808e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 5324 bytes
font_01_sfnt_off0000f8b5.bin
4d1f59678ba2d78ec8a0a49769fb847a1e1263498d0529a238d0269a4acc42e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 10804 bytes

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