Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6aceaffc44f18d…

MALICIOUS

PDF

131.4 KB Created: 2021-04-20 20:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 253a15c56129c083550ce4c232623235 SHA-1: 5289bb5630fd1ab61d48c01ee69f3a6f9adff683 SHA-256: 8e6aceaffc44f18d059000886416c535ec8bfb11ccf4bfeb5be815caa57ea0fb
186 Risk Score

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 0.9991

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://mezovuduw.ru/strik?utm_term=world+history+book+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413373/normal_603c55b0bf451.pdfIn PDF document text
    • http://outputqwvk.space/luwevaxokojafaxilog33pxr.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/homemade_3d_printer_plans.pdfIn PDF document text
    • https://tudodamoziw.weebly.com/uploads/1/3/1/8/131872054/5089344.pdfIn PDF document text
    • https://xevumijujivo.weebly.com/uploads/1/3/1/3/131383583/6608870.pdfIn PDF document text
    • http://xunawuloraxoru.22web.org/sejemuv.pdfIn PDF document text
    • https://zegibofes.weebly.com/uploads/1/3/4/4/134495781/joruwogilim-babalopumagitas.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/call_me_by_your_name_review_rotten_tomatoes.pdfIn PDF document text
    • http://insurerhome.ru/chefdom_mod_apk_android_1qkrn9.pdfIn PDF document text
    • http://blog-millionaire.buzz/mean_median_mode_ungrouped_data_worksheet_with_answers0dtz6.pdfIn PDF document text
    • https://ketijumorowifop.weebly.com/uploads/1/3/2/6/132682879/dusuwetufel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_600a914296dff.pdfIn PDF document text
    • https://neranutedaxujaw.weebly.com/uploads/1/3/1/4/131407849/9861996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://78f121e6-5824-477f-9480-4bf23eba804c.filesusr.com/ugd/9564ad_0286e69dfa50495ebfbd371ce93c40c1.pdf?index=trueIn PDF document text
    • http://satogitexuvo.myartsonline.com/basic_concepts_of_stock_market.pdfIn PDF document text
    • http://zivobojunoloma.epizy.com/17383900795.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_b87c1adecf814805880c965a59285b21.pdf?index=trueIn PDF document text
    • http://jamanofubuvi.rf.gd/56603084489.pdfIn PDF document text
    • http://mafovito.rf.gd/declination_letter_attorney_template.pdfIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_42cd68dd9a7c4fd8bd38c4d3d059232c.pdf?index=trueIn PDF document text
    • https://2ce49c0c-752a-49d0-a831-a69229ee2afe.filesusr.com/ugd/6e9521_6469be33fc4649c4b81675778dee7c83.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_e002c17026364636a8de98cb33a4d9cb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B62A 5328 bytes
SHA-256: ca12b03e7868c9ca9ae136d5bc32dc9bf8999eb1f77ecaa954c9bd2a97af82b7
font_01_sfnt_off0001c859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C859 11716 bytes
SHA-256: 347f1176826e03a2c21c63377c241b2b9b13655a8cfe208dc96b8968b8eb7cce
font_02_sfnt_off0001ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF9C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c