Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e79e2806ce5556…

MALICIOUS

PDF

76.9 KB Created: 2021-04-03 17:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e986361e37ef302b1681d74c6d3e9534 SHA-1: 5bc0b4cc636aadcbbad0d8a8c01967e7412b31fe SHA-256: 38e79e2806ce55564f2676a0da96b0c4c4d30a711e921cfc54b8060f7ae069b4
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a link farm on disposable hosting, disguised as 'cnn current election news'. This strongly suggests a phishing or scam attempt, likely delivered as a spearphishing attachment. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, as confirmed by ML and ClamAV detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=cnn+current+election+news PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416927/normal_605f2c1ec2edc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_603f17d9cf6f1.pdfIn PDF document text
    • http://fexodubavilukub.22web.org/interpolation_bioassay.pdfIn PDF document text
    • http://basidugom.mygamesonline.org/fool_for_you_sheet_music.pdfIn PDF document text
    • https://degunosusoteri.weebly.com/uploads/1/3/1/4/131453230/193203.pdfIn PDF document text
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/2256711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_60556f4454d9d.pdfIn PDF document text
    • http://lavorunolutoga.22web.org/cours_bardon_excel_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469358/normal_60563fe88cc07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_5fe6f027425bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vexeliku/platform_crutches_amazon.pdfIn PDF document text
    • http://vikibolo.epizy.com/what_is_29_cribbage.pdfIn PDF document text
    • http://forapijedowuvo.rf.gd/88446666760.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/xivoziduxizebedikaralizer.pdfIn PDF document text
    • http://fenasiwawasigi.epizy.com/37029728876.pdfIn PDF document text
    • http://tosakiviga.rf.gd/love_of_my_life_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/milope.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/mikikapetagonemugusadeve.pdfIn PDF document text
    • http://donufuruwitij.atwebpages.com/behaviour_chain_analysis.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_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 4580 bytes
SHA-256: 5fb55a0d9620102bd4ca4df49c60ceb5d40117c8a8b9e26878939f0768a01b4a
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 11036 bytes
SHA-256: 7d7208749f79f63e6d69ad90a2cb673cbf4f5f9168cd49aaf98e940402367880

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