Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced64dd824484cf1…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 03:33:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e5876de4a7e349084af19c84bdf64769 SHA-1: 73eeac1fce9f507a85c2cfaa0bc9665c3eeb2b41 SHA-256: ced64dd824484cf18c3de943a17d71dffaeb24639bda9714c0e662bd4e4243d5
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 hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

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://xajibur.ru/wix?keyword=redox+reactions+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411714/normal_602658c4cc657.pdfIn PDF document text
    • https://tetoxoji.weebly.com/uploads/1/3/0/9/130969306/sunuzamiluwi-nibowogan.pdfIn PDF document text
    • http://tixaman.scienceontheweb.net/article_writing_for_class_6.pdfIn PDF document text
    • http://aycotoro7.xyz/108217086095d1eq.pdfIn PDF document text
    • https://raguloduw.weebly.com/uploads/1/3/4/0/134041620/5281664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461766/normal_5fe7cf649992c.pdfIn PDF document text
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/06bb395231007.pdfIn PDF document text
    • http://maewallace.com/eotech_512.a65_reviewyxnef.pdfIn PDF document text
    • https://borotopod.weebly.com/uploads/1/3/3/9/133997632/kurakixamoba_kudijuwat_waripafuzelilet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_5fd2265078165.pdfIn PDF document text
    • https://kuvekimat.weebly.com/uploads/1/3/6/0/136052924/vutiwevivoteronep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_601081b5ab004.pdfIn PDF document text
    • https://kiwakobomu.weebly.com/uploads/1/3/1/4/131482833/1675759.pdfIn PDF document text
    • https://kegegofelev.weebly.com/uploads/1/3/2/6/132681159/vutafeviwipufi.pdfIn PDF document text
    • http://static-get.top/kejemoratuow0u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_d56a234a775840f68a89e66a0f9f5cbe.pdf?index=trueIn PDF document text
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_bb2e7f817d5449ec84f3304ee816df4d.pdf?index=trueIn PDF document text
    • https://2c0370cf-43ec-4dc9-8589-ec1e7793a70d.filesusr.com/ugd/404058_5d297725046e447596a81ca1e85fa093.pdf?index=trueIn PDF document text
    • http://xekabotiwuker.atwebpages.com/gegimaki.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_8027e27c9f394fa6b5c547cdb6b1d07e.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_d695fc9f7f8141818f67263d979e7494.pdf?index=trueIn 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_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 5440 bytes
SHA-256: f65896ea21b65da0bf34eb4376dc5dc8811a389e12d2f77855bc03e65c956cd2
font_01_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 10824 bytes
SHA-256: 94b7bbe28e6e4320d373ba2eeb36b378006978a0c09a633a4f35e809cb1f5420

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