Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fd7696f030cf15…

MALICIOUS

PDF

74.8 KB Created: 2021-03-28 19:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b41dc9b2987508884d935889699c2091 SHA-1: 5542b193ef9e11a2be8986bb55ae48517be070ff SHA-256: 19fd7696f030cf150bf335385bf0fd730e166f3ad220cd098eef9af11467ea14
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://jumiwimov.ru/award?keyword=wrestling+weight+training+program+pdf PDF link annotation
    • https://cdn.sqhk.co/noneniwetav/dgdGAhi/99279113157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450419/normal_5fe132499698f.pdfIn PDF document text
    • https://cdn.sqhk.co/xamizine/jcxehRF/xilasus.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxexaxi/3ibeiEY/dapagemosi.pdfIn PDF document text
    • https://cdn.sqhk.co/fotajoge/iafidjh/jogar_dama_online_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/igicMbM/37244868532.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5fcb60e74d848.pdfIn PDF document text
    • https://cdn.sqhk.co/romemanir/jghjcgj/mario_game_gallery_soundboard.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/ihhchbr/52122573595.pdfIn PDF document text
    • https://cdn.sqhk.co/tojebaru/Fjdzbhi/xuzuxurosebadas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468550/normal_60490482a6641.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_e079e2e4daf04d0c94697fcf4442e05c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/18533845865.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/vugojetewujudamurusawafif.pdfIn PDF document text
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_3f2c90087f0c481dbfab2ac35121fbb4.pdf?index=trueIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_c5b35b40d1dd4d9d8384254a9188e24a.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_45b559ec84be42e09e979e7fd995293f.pdf?index=trueIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_90d78f05a9454dc996dabc1bfa40678b.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_f876debbb8094e139ee133795eafd5ec.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_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 5560 bytes
SHA-256: a1333ee83a32fe80f83be8666f6942f2354e2ac4374032b26a39abd6170cec25
font_01_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 10096 bytes
SHA-256: 0d159e2f56c98321ffa6edb48ad25ee073daca482129634f1f2124187e9b2817

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