Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cb737cee693a8b…

MALICIOUS

PDF

79.0 KB Created: 2021-03-04 15:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 318359ad41279da903b643e0e50aa48e SHA-1: 09e0757dbc203c6fb9290b5c4e99b0668fb9b40e SHA-256: e2cb737cee693a8ba6d42f97ae9693d0a5e23af06a53a3729b9238199517cb51
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+run+an+online+retail+business
    • https://static.s123-cdn-static.com/uploads/4471230/normal_5fff08469d99b.pdf
    • https://static.s123-cdn-static.com/uploads/4488139/normal_5fcfec357ad2b.pdf
    • https://cdn-cms.f-static.net/uploads/4409616/normal_600c67b6ee30d.pdf
    • http://ital-tess.space/38697301725r8wju.pdf
    • https://cdn-cms.f-static.net/uploads/4371248/normal_60370a7d2541e.pdf
    • https://static.s123-cdn-static.com/uploads/4365626/normal_5fecbc1d00a76.pdf
    • https://cdn-cms.f-static.net/uploads/4423714/normal_603554ac12695.pdf
    • https://static.s123-cdn-static.com/uploads/4412899/normal_5fdd86fe3cfbb.pdf
    • https://cdn-cms.f-static.net/uploads/4462066/normal_603d278fdcccf.pdf
    • https://static.s123-cdn-static.com/uploads/4445742/normal_5fcf847c1117e.pdf
    • https://static.s123-cdn-static.com/uploads/4469847/normal_5fee131357eee.pdf
    • http://tovarzone.ru/ribokasaro38qfj.pdf
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5fdc6cf26f3c2.pdf
    • http://topdouche.xyz/tazemugsfwwj.pdf
    • https://static.s123-cdn-static.com/uploads/4413012/normal_5fedc0449022c.pdf
    • http://cashbackmoney.info/dr_najeeb_written_notesv57c3.pdf
    • http://istlan.space/miami_beach_police_reportssiku0.pdf
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fd2ecd9b7c59.pdf
    • https://static.s123-cdn-static.com/uploads/4444856/normal_5ff3b6e5f21b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_c49cf07f35594964b190cc598cef1063.pdf?index=true
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_f68b61cff6a548a0abaa54f6760a62e9.pdf?index=true
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_832907920cad4c43af4238e5ded6b241.pdf?index=true
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_59edb9a9b3674bf5958a04cde3317b96.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f521.bin
84782e45e2eb0a15610df0b9b9156c7d7d25c7a33ac871e936b3dae5079fb7fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 4872 bytes
font_01_sfnt_off000105c9.bin
d1b01a7b5faf2688403a24be8775e59f274009ca86e886be1e3f35e356b7592e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 11532 bytes

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