Malicious PDF — malware analysis report

Static analysis result for SHA-256 99357163dbce84ec…

MALICIOUS

PDF

78.1 KB Created: 2021-04-12 19:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d5431dc963181772bb1ab46eb5f5dbd7 SHA-1: 23764b594993d00ea517da04d91f5885aec04668 SHA-256: 99357163dbce84ec704ea3c33afd38beff19edca7c09d171029fad168061dcec
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is designed to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/strik?utm_term=derechos+humanos+lista+resumida PDF link annotation
    • https://fuvutefimege.weebly.com/uploads/1/3/1/4/131453053/3508474.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/ihn2hiV/bukedajevosozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_6022a36beed93.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/iBjbtih/alienware_keyboard_aw768_software.pdfIn PDF document text
    • https://pawigesi.weebly.com/uploads/1/3/5/3/135389203/1122035.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/2igiijf/99885009354.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412887/normal_5fc9ab24dc57d.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/vmjiU7d/washington_state_marine_parks_covid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485809/normal_6029989482994.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/idij4LS/loxomix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458839/normal_605d8034cee1c.pdfIn PDF document text
    • https://cdn.sqhk.co/bepesewutu/XigjgeI/hero_strike_3d_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/bhehhkt/socket_server_write_java.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/K7gcwKd/71316286196.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_1148dbc2eb464a5c8f74c45d47a508bc.pdf?index=trueIn PDF document text
    • http://xemozaso.rf.gd/dozoziradewuwebaj.pdfIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_afbdcc80145a44b8822160b58f2389b5.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_a4bd30e073b2493e9a99496bac8707b9.pdf?index=trueIn PDF document text
    • http://silimafimutoj.rf.gd/zufifalinekalujerone.pdfIn PDF document text
    • http://zujazeku.epizy.com/25652556022.pdfIn PDF document text
    • http://nanabiwilave.epizy.com/31721094278.pdfIn PDF document text
    • http://nekabet.epizy.com/pdf_portfolio_of_graphic_designer.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_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 5180 bytes
SHA-256: a10450f8301d8f5f49f3e09155ba0aa07f8568b5178c7171bf5af8e3bbb86a5a
font_01_sfnt_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 12140 bytes
SHA-256: 60cfcef0ea9f436b269bad33280ac6e50f8d3f4cd3f6bd8ca326092dc17eb9d5

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