Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe13888c65245218…

MALICIOUS

PDF

100.9 KB Created: 2021-04-06 07:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: edaec9b4c575b3b2c958e8e5e4820ebc SHA-1: 141c1a2c194bd801ccd566974fbb5bffc479e7bb SHA-256: fe13888c652452189903ceed31f2f771fb2918845cd4d79592e0d61b382be945
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://midufefew.ru/wix?keyword=new+ology+tv+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403679/normal_602c8a5a2352c.pdfIn PDF document text
    • https://kikizesojumare.weebly.com/uploads/1/3/4/7/134718780/jaxivavosirowilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488332/normal_60061ee8aa1ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481990/normal_6029647a9e206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_5fdbaa64e30bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_604504d027fc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_6062dff35bb16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_6052f9afeaa68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_600ca5cac1c02.pdfIn PDF document text
    • https://kegozogoro.weebly.com/uploads/1/3/4/5/134525602/rozuvu-rutiwuzipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kibulirol.rf.gd/jegelesurudininuvugenivip.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/wajepedaxuraposekigap.pdfIn PDF document text
    • http://vivemowirarok.rf.gd/the_silk_road_recording_the_journey_dbq.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/hp_officejet_6500a_plus_clean_print_head.pdfIn PDF document text
    • http://warejuratunu.rf.gd/xejafitasezu.pdfIn PDF document text
    • http://xebinuv.rf.gd/bash_script_set_variable_command_not_found.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/alimentation_bb_6_mois_tableau.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_off00014b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B65 5000 bytes
SHA-256: 984f3a30914d16bd42fd40e6bc14ba322651711e7300ae4ff68041370db8930f
font_01_sfnt_off00015caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAA 12100 bytes
SHA-256: aff58aa7ddf916e2c9f8344573d46784c0d5a4356e2b03b8f839e7a18add92cc

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