Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d92f24f0e1eda4…

MALICIOUS

PDF

80.8 KB Created: 2021-03-28 01:09:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba4b5e1ebe8254d72ede477a20b8e4e4 SHA-1: 775236608d743409d333c875f97d968f14afd7b0 SHA-256: 17d92f24f0e1eda46b16e08be3076a35e4271b78019ecc9ede5d60e884dd103f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://lozipotod.ru/123?utm_term=riddles+and+brain+teasers+worksheets, which is likely used to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=riddles+and+brain+teasers+worksheets
    • http://jubigale.scienceontheweb.net/define_application_software.pdf
    • http://tinesoxexi.22web.org/taruziguvi.pdf
    • http://takodevizol.iblogger.org/vidmate_for_ios.pdf
    • http://wusozupu.mypressonline.com/keto_diet_vegetarian_meal_plan.pdf
    • http://zokidinodajives.getenjoyment.net/basel_3_regulations.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_4412836820394563af3869e76aa0865c.pdf?index=true
    • https://s3.amazonaws.com/vukujidor/26379401274.pdf
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_70e7eec1d5a74b5d8b285e0868ad1aa5.pdf?index=true
    • http://wipibefab.onlinewebshop.net/life_below_stairs.pdf
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_7b0c3d14e6b24fd99218fe6eafb1eaab.pdf?index=true
    • https://s3.amazonaws.com/lemefofutomapox/feturafijepe.pdf
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_1e34127c8819435ca8efc3360d46a5dd.pdf?index=true
    • http://sowutafamewuben.rf.gd/json_formatter_sql_server.pdf
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_5836b7b8aec843928ed76799396cb2ae.pdf?index=true
    • https://s3.amazonaws.com/jitimesolagun/37432123387.pdf
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_1fe75c6d90d24ec9946dd3aa3f9dd47a.pdf?index=true
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_75891e0fdc9547a889e7cc28760e6cb5.pdf?index=true
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_2740b5f94ac84ca9998835a60124a400.pdf?index=true
    • https://s3.amazonaws.com/xasovewipeje/91438673324.pdf
    • http://pewijaxenutudum.rf.gd/77110047398.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/49530193214.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd43.bin
8215f19634b0491388dfa6f4220316aa38b83c10a2c21caa3f2eb4c38d3e2e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 5216 bytes
font_01_sfnt_off00010f0b.bin
c4143c043b5e54f77b1b99601344a3a15db366fc4ff8e1a4dbf9d6b03d6827ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0B 11292 bytes

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