Malicious PDF — malware analysis report

Static analysis result for SHA-256 a412f758509834a4…

MALICIOUS

PDF

82.2 KB Created: 2021-04-01 14:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b8421fea1c4ee836405bbbe198f71b9d SHA-1: eb0f143f1d3752e43f3f4e3f1edce47ab67f8ad7 SHA-256: a412f758509834a4a45b0b7fba795bc100102f8f0c42e69fa9b7388a8ca9bb93
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=vizio+sound+bar+bluetooth+pin PDF link annotation
    • http://newuwedeza.mypressonline.com/business_for_beginners_book.pdfIn PDF document text
    • http://majikok.mygamesonline.org/how_to_answer_summary_questions_in_wassce.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/24798730871.pdfIn PDF document text
    • http://popisazono.getenjoyment.net/bayesian_modeling_using_winbugs.pdfIn PDF document text
    • http://lalabomujulimof.mywebcommunity.org/diferencias_entre_capitalismo_y_socialismo.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/51994110261.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_cb5b369b4d3342ce9f63780452150fb4.pdf?index=trueIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/zalibibifatomemev.pdfIn PDF document text
    • http://jarepumemaxi.onlinewebshop.net/livro_alter_ego_a1.pdfIn PDF document text
    • http://bopasewawimugu.epizy.com/20804454420.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/64325034823.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/2611385331.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/70458045787.pdfIn PDF document text
    • http://bividit.rf.gd/9993320563.pdfIn PDF document text
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_4dee5ef856db429aa65fe01e134e124e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fokapikow/25809122182.pdfIn PDF document text
    • http://zagufuv.epizy.com/diablo_3_season_22_wizard_tal_rasha_build.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/74739810295.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_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 5200 bytes
SHA-256: 23bdce9954210911419ccfaf43429e54f8cde6b6d1d14f9f0f39b8b35b0d46bc
font_01_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 10724 bytes
SHA-256: c7b60c66f18d29a19a7be0cfb11833e2db6a74897fec3efc8510adf06cd45b4c

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