Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c70523fb6ae84d9…

MALICIOUS

PDF

77.1 KB Created: 2021-02-27 03:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 175d7eb002d743870f236d3c02d7bdbb SHA-1: 4484bb9f18e0828edb8a2bdec96e2b3cd63bfa9b SHA-256: 6c70523fb6ae84d9e5d4e7d00d7685627c9d04261ba222c31851d89c187569e1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/award?keyword=best+c%2523+book+for+beginners+reddit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380680/normal_5fe5b4b2a213e.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/534ae.pdfIn PDF document text
    • http://shortsomfj.space/90174179053wv3k1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471958/normal_6017ce62e7c7f.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/how_to_connect_hoover_steamvac_hose.pdfIn PDF document text
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/tivozujif.pdfIn PDF document text
    • http://zogometemo.sportsontheweb.net/99838447457.pdfIn PDF document text
    • https://xovisifolato.weebly.com/uploads/1/3/0/8/130814526/jajufogebigafuleme.pdfIn PDF document text
    • https://vudunige.weebly.com/uploads/1/3/5/9/135981242/6711558.pdfIn PDF document text
    • https://gijamaxo.weebly.com/uploads/1/3/0/7/130740113/rexosagijil_tuniwanosirowe_zavolez.pdfIn PDF document text
    • http://fresh-ita.space/83724564342rhiv0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423728/normal_5ffd7433e75f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sesilav.rf.gd/64214088402.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/transformational_leadership_nursing_journal_articles.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/zuganasufuta.pdfIn PDF document text
    • http://xipokawopigigig.epizy.com/barcode_128_font.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/simple_admin_panel_html_css_template_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/ohioguidestone_stark_county.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/lagafimaluzatafar.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/4758056650.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_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 4504 bytes
SHA-256: f88d057d19b0ea1526c5a87954ad4c95828936f06301362e01f74b0d19819544
font_01_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 10676 bytes
SHA-256: d53038e7d07186bbf106bd96131da67cd5cb5ce1a67189bdadc9e9d9d66836e6

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