Malicious PDF — malware analysis report

Static analysis result for SHA-256 829607ae99865856…

MALICIOUS

PDF

66.9 KB Created: 2020-12-02 23:37:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d181c5848ce5908d43a6a5f110135fd6 SHA-1: 9b4c8f66c580075e659d573cf6a1741aa548ac48 SHA-256: 829607ae9986585616abc5e3db472dc19fba62d5296f6cb02c13edfdccdb952a
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://trafftec.ru/strik?utm_term=sonic+strawberry+shake+nutrition+facts PDF link annotation
    • https://ditiboxoteripu.weebly.com/uploads/1/3/4/7/134763901/pevejuvejafab-tafolupimulo-fojavivetemimi-doleve.pdfIn PDF document text
    • https://vurazomuloja.weebly.com/uploads/1/3/4/3/134322302/faxizamomozabi.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/717435.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/xekesesifozedi_rovujuvefipapox_mowuvuwopededet_biregofoduse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f9e3710ed598.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497109/normal_5fc48f690207f.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/tolulis_sevufaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_5fc17733627b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/curso_de_capelania_hospitalar.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc011b424b06a7eb3fa7d30/t/5fc1a1185147b1480470991b/1606525209507/4535041102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b2d807a-0cde-4253-8a42-951d282f8d18/bexozurubibegu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0012c12facd59cea80d2a/t/5fc13fd2f3de5e49b5924486/1606500307203/10580312138.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf99d00f7af3919d35818/1606220190119/rofuzal.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/mamiya_rz67_ae_prism_finder_manual.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_off0000c8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B9 5440 bytes
SHA-256: 0dd0ed414b66f917372fdf54fb06431ece70090fcf13c2c3f0d91fcbdf4f4751
font_01_sfnt_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 10396 bytes
SHA-256: aa6b4e74bf2826b7005b4522beb9a7e9e6978daffde73fe25ba1661d3a9bda22

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