Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c770ec610179e31…

MALICIOUS

PDF

76.7 KB Created: 2021-03-07 10:33:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c5b0efe08b5a6306fda880d273ea5ee2 SHA-1: 196d8ac5e9b43038dd5771f220cd357fa6f58b83 SHA-256: 6c770ec610179e313dc6e6d70fc4a8fc91dab2e9d55b3d3400b48316bedbec0c
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=how+to+write+a+general+problem+statement PDF link annotation
    • https://cdn.sqhk.co/vumivatuvi/gi0gghc/fovipufuvuzad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449630/normal_603be797446b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_5fda0344a6a0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426676/normal_6018ca416aed0.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/xozibodikaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447101/normal_6031f7d94141f.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/budewedezidabijunux.pdfIn PDF document text
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/5401285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415070/normal_5fe538517b6b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423133/normal_5fd656fd39b03.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/ZNqUhej/tiny_archers_old_version_mod_apk.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/jafulusozuxe.pdfIn PDF document text
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/071ef5dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_5fd399c1cc673.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/qjbighh/53895627342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_601e69e0b3344.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_d3febdc90b9540bea9fb7eb429159d8e.pdf?index=trueIn PDF document text
    • http://piwakitidi.onlinewebshop.net/24578561120.pdfIn PDF document text
    • http://mawokale.myartsonline.com/identifying_similar_triangles_worksheet.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_93e99b8812d0424ca7e7d807841c95de.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_2dd65e78c46c4f1e9f365edd10be9d6f.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_7e7045d32f384994b12074291c96ebfe.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_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 5332 bytes
SHA-256: 6faa086eb51ba15c59dd95ee102c2da2b7db6b8db5bdc3ca940083f2fa008722
font_01_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 10700 bytes
SHA-256: 607a51885a22a436c96576779a9c09dc86504f41e1c72a2230248425f57ae718

Open this report in the interactive analyzer, or submit your own file for analysis.