Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e66145d3ba2587…

MALICIOUS

PDF

127.9 KB Created: 2021-02-21 15:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 77c002affc964241d458939be7527797 SHA-1: d7c0bf6f4d8f4fc5e0de4167f88f214e2073aa66 SHA-256: e4e66145d3ba2587f80c09162ca186aee3b40f628e89dd0fc0bc1cd616383de9
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • 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 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/123?utm_term=brown+v+board+of+ed+impact In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366405/normal_5fff7f20e9243.pdfIn PDF document text
    • http://wordsidepost.top/cbse_private_online_exam_form_2019j0691.pdfIn PDF document text
    • http://tevuvisena.iblogger.org/nigegigosuruwajofokawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_602a93c3a2502.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385436/normal_5feb4e39bf11b.pdfIn PDF document text
    • http://astrohelp.space/nokilosobimitxfkxf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bokonejedebi.rf.gd/font_horizontes_script_bold.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/bmw_car_and_bike_photo.pdfIn PDF document text
    • http://fovuxux.rf.gd/jurom.pdfIn 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_off0001b91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B91E 5432 bytes
SHA-256: 17f28b45df55d6733afec62b764de570a588ab6ce86d7a31ef82e4a2576b8074
font_01_sfnt_off0001cb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB9E 11480 bytes
SHA-256: bc019c7c749abc48bc2f73d6a53a7a3df10eda01bfba73f10db8eaf95b78c6c9

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