Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bad8cf2ef192f5…

MALICIOUS

PDF

68.1 KB Created: 2021-02-23 12:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b483604317e03ec6b2ee76d3d0d2d669 SHA-1: 5ebc7e2b140977fdc9af81be4db347a7d6a7a775 SHA-256: e8bad8cf2ef192f5c4a6dcc7dc228b84bd0cca9e3ae6f656e8404fba571af7ca
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://seumenha.ru/strik?utm_term=scale+drawing+worksheet+grade+6 PDF link annotation
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/27d3c1.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/RDAiEC8/free_games_news_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/5jhihEk/planetware_naples_italy.pdfIn PDF document text
    • https://vusowixaxepuw.weebly.com/uploads/1/3/1/3/131381533/1823175.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/7000540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_5fe7917d17c8c.pdfIn PDF document text
    • https://cdn.sqhk.co/katafojedul/3flmZgc/w3schools_css_animation_rotate.pdfIn PDF document text
    • https://nokafixawawi.weebly.com/uploads/1/3/1/6/131606940/dfbc99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481527/normal_5fdf9c1e6c377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388038/normal_603442f2644e4.pdfIn PDF document text
    • https://geregilewupune.weebly.com/uploads/1/3/4/8/134849809/vajulidetulizoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_6033e4d4cb807.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5ff78359d8a5f.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/vgjiaic/58358192708.pdfIn PDF document text
    • https://cdn.sqhk.co/wogirujut/jThfNLE/5243456783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503533/normal_5ff7e1f321196.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCC 5612 bytes
SHA-256: e84c53a92b38f314324ae9ec3fa49a189a74bf2bda089450ec55de79083da090
font_01_sfnt_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 10460 bytes
SHA-256: d4f461984cf818209f173e1967644f9891f3521d4a5947245ade559c5d464297

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