Malicious PDF — malware analysis report

Static analysis result for SHA-256 72170416a4a0223a…

MALICIOUS

PDF

76.7 KB Created: 2021-02-24 01:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 64f204cd6464a84c7edabc5b717e8aa6 SHA-1: 849e3cb44ffd7d1fff16e02a7b0825a1c4df640e SHA-256: 72170416a4a0223a34da2f824b9a1e24a6ca581246f1a7ce2d1ebce8daa48566
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=curley+k+8+school In PDF document text
    • https://cdn.sqhk.co/wolanojijen/o3heOMv/mamubekolapov.pdfIn PDF document text
    • http://sesopob.iblogger.org/22158979626.pdfIn PDF document text
    • http://testersairf.xyz/lopisewanbr03o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446635/normal_601c90c9f1e2f.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/j3jh6he/3115718031.pdfIn PDF document text
    • http://dommasters.site/gift_certificate_template_ukzbusc.pdfIn PDF document text
    • http://introdom.ru/mcdonald27s_operations_and_training_manualsytu1.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/6gegezd/7660843841.pdfIn PDF document text
    • https://cdn.sqhk.co/vamapoludi/geo7NvE/star_picket_remover_brisbane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sifusavukaga.rf.gd/lasotaloratus.pdfIn PDF document text
    • http://pododugeb.rf.gd/miligexe.pdfIn PDF document text
    • http://fazegixedibuw.rf.gd/6th_grade_fiction_reading_passages.pdfIn PDF document text
    • http://jesebikalag.epizy.com/sawoturebeduz.pdfIn PDF document text
    • http://jonilobasi.epizy.com/tukopo.pdfIn PDF document text
    • http://xunawikavamenu.epizy.com/environmental_management_system_template_small_business.pdfIn PDF document text
    • http://wevevaviz.epizy.com/97506536488.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_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 4940 bytes
SHA-256: 37e9fbbf58f7a4f825a93842c97b4e10a3a141a3e1367f2cabb33e1f8379f9c7
font_01_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 10916 bytes
SHA-256: 65126076dd68aa024d45b35a4783ddeb7aaac5f4fb0edfe4539ae07f7518b680

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