Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc17026ed48975b3…

MALICIOUS

PDF

68.5 KB Created: 2021-03-24 17:01:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 818cd00034a33e9b26a751aeb3e07d8c SHA-1: 598bc1498d5006a1cbbd0d410ef9a70f0cd8c287 SHA-256: fc17026ed48975b3a51e6b8ed19f97bbd5ccfb9dc058db79dbec5967eef15fea
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document, likely a spearphishing attachment designed to redirect users to malicious sites.

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://druttle.ru/wix?keyword=deca+missouri+state+competition+2020 PDF link annotation
    • https://raduwefun.weebly.com/uploads/1/3/1/1/131164260/misowugebelirevijolo.pdfIn PDF document text
    • http://gusaluna.iblogger.org/rijixebomuzume.pdfIn PDF document text
    • https://mesowusiwa.weebly.com/uploads/1/3/5/9/135975120/xeral_lerajinibaxo_kutufisur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368978/normal_5fdfc50297231.pdfIn PDF document text
    • https://meruxanige.weebly.com/uploads/1/3/1/6/131636855/e55b83c9f6029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482854/normal_600b33cb2b3f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_603ae787be88b.pdfIn PDF document text
    • http://milesatel.mygamesonline.org/aliments_riches_en_vitamine_k.pdfIn PDF document text
    • https://fugubujezowegi.weebly.com/uploads/1/3/4/5/134502495/c51d1cb105a37b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://forojiwimudobo.atwebpages.com/the_unwanteds_quests.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/medicine_daughter_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e83cdb31-963c-4da6-9027-665d8d908982/10435786559.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/67938929357.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/vanejelitozede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44333226-4ead-451f-b593-8ae5c2cfb94c/54327547478.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/64009010814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ada1b42-5819-4831-868b-a7025c7b15e8/tepuzaguwujuramigujilo.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/lazolefovupisub.pdfIn PDF document text
    • http://seroritubofa.atwebpages.com/malabar_biryani_recipe_in_malayalam.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_off0000ce78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE78 5320 bytes
SHA-256: c72e1e1cdf00eac2a322ae3b17e2b42f081ecda134049134ac2533b6ed444b54
font_01_sfnt_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 10208 bytes
SHA-256: fd18fd21677f9571fec963a312d620a97a1101aa07265e0948aa9932a3daa5bc

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