Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25919d63ae3c22a…

MALICIOUS

PDF

77.7 KB Created: 2021-03-07 23:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f6fba744c531b2ef4ce68ca2fa29381 SHA-1: e500a26049f57bc26dde5f7f4d9de6658f53289c SHA-256: c25919d63ae3c22a330ae02a4f641257877a1691352b0ffa7864991a866a8d39
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with a primary URL pointing to a game-related APK. This suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/wix?keyword=game+gem+android+apk
    • https://cdn-cms.f-static.net/uploads/4407989/normal_60161d7080b3f.pdf
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/xowetezuw.pdf
    • https://cdn-cms.f-static.net/uploads/4389568/normal_5fdc5f78ceb3f.pdf
    • https://weruvuwixaxo.weebly.com/uploads/1/3/5/9/135972833/1896858.pdf
    • https://cdn-cms.f-static.net/uploads/4415944/normal_5fe8d3ef43b04.pdf
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/kofalederu.pdf
    • https://cdn-cms.f-static.net/uploads/4382003/normal_6010eeb3115b3.pdf
    • https://static.s123-cdn-static.com/uploads/4474989/normal_5feff5ca7ed7b.pdf
    • https://guvujuxedudekef.weebly.com/uploads/1/3/1/1/131164066/xabogiva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_bbd9143574da4bac84e81354d8eed128.pdf?index=true
    • https://s3.amazonaws.com/nafoxuda/jisupanawofor.pdf
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_21aa72c838074f5684336c1caffcd263.pdf?index=true
    • https://s3.amazonaws.com/fidefofudi/great_gatsby_chapter_4_quiz_answers.pdf
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_206e2b1b20dd4092b304026b2bffb1c3.pdf?index=true
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_610f773c29434e438bf7bf3575777d18.pdf?index=true
    • https://s3.amazonaws.com/rimepusox/kemewitepodobevuvosevadip.pdf
    • https://uploads.strikinglycdn.com/files/a84d5496-21c0-4dd1-8f0f-61663489f1f7/singapore_math_curriculum_kindergarten.pdf
    • https://uploads.strikinglycdn.com/files/756ee7bd-2a56-4bf1-b289-302e46782389/how_to_set_up_zebco_202.pdf
    • https://s3.amazonaws.com/jenagubadopi/lodonisekaketigij.pdf
    • https://uploads.strikinglycdn.com/files/f434fdc5-3a44-4bf0-8beb-b989f1d7b56d/bekelegasokapokegekitovu.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_off0000f403.bin
3a5fd39aca2b93e0f46c39c799ce0930f54e66ff974402a659b36f535635e39a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 5164 bytes
font_01_sfnt_off00010581.bin
81c456ef8229af2dbb98b732ca2a599473f4c956da2affad93f674c10bf816ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 10460 bytes

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