Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35ce1a4b5f92140…

MALICIOUS

PDF

77.0 KB Created: 2021-04-05 16:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 682aeadc332e573aa417d59bfae777b7 SHA-1: 56928ad52c6af5136fbee9ddffc6ec24bec4d914 SHA-256: d35ce1a4b5f92140c3eee084a6afa310cb18f688ebe955c5d4cc4c4b813fc83f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=train+tickets+booking+app+free PDF link annotation
    • https://fujareke.weebly.com/uploads/1/3/5/3/135391043/f41ad94ce0a1ad5.pdfIn PDF document text
    • https://tefovaxosu.weebly.com/uploads/1/3/1/1/131163863/bb16ceda8c1f18.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/bdd96ba4ba11dff.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/1ab8bc008a5b8c.pdfIn PDF document text
    • https://rekazisiw.weebly.com/uploads/1/3/0/8/130874265/5413765.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/woronok.pdfIn PDF document text
    • https://wupuvogobed.weebly.com/uploads/1/3/4/5/134507139/nolonuwuxarizum.pdfIn PDF document text
    • https://vujipobunovopo.weebly.com/uploads/1/3/5/3/135324227/1835971.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/pevebekupixebepo.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/gfCiaWL/kung_fu_panda_3_runtime.pdfIn PDF document text
    • https://lenopeseku.weebly.com/uploads/1/3/4/0/134040497/8450098.pdfIn PDF document text
    • https://sovopubi.weebly.com/uploads/1/3/0/7/130775052/xaxiborovolus.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/hJBo1A3/army_of_darkness_game_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9e4ade5-ce9e-4145-898a-8d11c7d8092d/11235525453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a2c24ee-74f5-418c-88f9-3b44a20e39cc/full_stack_react_projects_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4fdd00-96e7-418d-bc30-8c590f0544e4/parts_of_speech_with_examples_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63c36e8-88c8-4b8f-a544-d9b9073241d6/dutch_grammar_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e50d0b-627f-41fc-8296-7b20a0143797/31420231892.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_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 5304 bytes
SHA-256: 482941d4fd5e9d438ccf790116f35c0d4292db97e2bf31075910ed115da9bcae
font_01_sfnt_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 11056 bytes
SHA-256: c037865a7c28a01e68e3fa59e39d9f8f250513ba7b612629aeec55f446c44749

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