Malicious PDF — malware analysis report

Static analysis result for SHA-256 6103c78c0cce6f13…

MALICIOUS

PDF

73.6 KB Created: 2021-02-03 19:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e72d670bb7d21de9c5e99de8ca392ff4 SHA-1: a354351e4311ec3b549935360fd8f7711a5765ad SHA-256: 6103c78c0cce6f137dae51874fe76a81de9f427ff3515c54d8f28cb36f8f7d6f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous external links, characteristic of a link farm, and is flagged by ML classifiers as malicious. A critical heuristic indicates it attempts to lure the user into executing commands by instructing them to copy and paste content into a shell. This suggests the document is designed to facilitate the download and execution of a second-stage payload, likely a trojan or phishing tool.

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://jacksth.ru/wb?keyword=crohn PDF link annotation
    • http://legrand-spb.ru/dxcpl.exe_download_64_bitahzj5.pdfIn PDF document text
    • http://agent-ritual495.online/zara_home_furniture_review0h3do.pdfIn PDF document text
    • https://cdn.sqhk.co/vejanozugova/jcMbvhc/90932498161.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/FgejgNF/kifeniru.pdfIn PDF document text
    • http://wowunoli.22web.org/witevuvozojesif.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/hjaUEhb/musicals_on_disney_plus_uk.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/senaputitusomumuv.pdfIn PDF document text
    • https://cdn.sqhk.co/naxusepimosa/hmhagh2/tanenapetiduviv.pdfIn PDF document text
    • http://vudujupuboneg.22web.org/34299141842.pdfIn PDF document text
    • http://spindlndou.space/minecraft_1.4_0.1_apk_indiraubmg.pdfIn PDF document text
    • http://onlinesos.tech/638131509558o6kq.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/nukilusuxibulajiwiben2gcf.pdfIn PDF document text
    • https://gugabezari.weebly.com/uploads/1/3/4/5/134577353/283789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485718/normal_60082920117fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://difedomuki.epizy.com/93183962008.pdfIn PDF document text
    • http://zaxesagujudiwa.epizy.com/jevutexosozogoniturukefov.pdfIn PDF document text
    • http://wegatanubuguze.rf.gd/liverpool_vs_tottenham_highlights.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_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 5024 bytes
SHA-256: 04c96d342f19f5fbe089a47fadb5b5c2cfab3e93c3669db00215f71bff7b0feb
font_01_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 10280 bytes
SHA-256: 86b87f3ccfff75787e34bff36d65548cc85a2af401dd3e3f3321ae4e0fe64ae2

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