Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd40d8866e1e2673…

MALICIOUS

PDF

74.5 KB Created: 2021-01-06 21:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 672a2034b084a49efcea1411f668c9cf SHA-1: c2b0e2df9ac62e45e992234fe1d6742bda171af0 SHA-256: fd40d8866e1e2673d2a5560c6a5c0359ee28b4b184cc47f1a26f459bdac6fbd9
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirector infrastructure, indicating a phishing or redirection attempt. The heuristic firings confirm the presence of malicious redirector links and a link farm on disposable hosting, suggesting an effort to obscure the final malicious destination. While no scripts were extracted, the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/aws?utm_term=catholic+tamil+bible+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454042/normal_5fefbf3650b52.pdfIn PDF document text
    • https://fodorofofojep.weebly.com/uploads/1/3/4/7/134769626/lumadoduz_xebapomubisatu_zuvegopap_pozuzib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_5fa836c9d3095.pdfIn PDF document text
    • https://fetedujas.weebly.com/uploads/1/3/0/7/130776810/8253238.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/5c6d94e563.pdfIn PDF document text
    • https://viwizabodug.weebly.com/uploads/1/3/4/5/134509287/gomesorunesolopaviwa.pdfIn PDF document text
    • https://loraxero.weebly.com/uploads/1/3/4/3/134332649/5530a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465908/normal_5fdfffbdd2c90.pdfIn PDF document text
    • https://cdn.sqhk.co/sigagegijej/ggg0Bie/80228314477.pdfIn PDF document text
    • https://cdn.sqhk.co/feledigowud/h2B0hgj/95884110837.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/E7JijUH/vuxupiwuganajemabizijalab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369508/normal_5fc78b6828197.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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 5168 bytes
SHA-256: a08ad0b8dd0481fb4245052adf7a8a1158e2505b044b5e8a477bd08d0aeeca59
font_01_sfnt_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 14624 bytes
SHA-256: 5b30c61ac2e1d32da3d2d9d7d94df2e10c9997de5cc3faad3c433c28e6d1fe23

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