Malicious PDF — malware analysis report

Static analysis result for SHA-256 d262f390af3daa55…

MALICIOUS

PDF

80.2 KB Created: 2021-03-27 12:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b5018a6b285ea759c851426ad2e4f2be SHA-1: ee128ed76f5437627c2274877b6b7bd7315281ef SHA-256: d262f390af3daa55d6e57c97b8a45e69d6b4bdd17a50171ba422499f5214bf82
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm designed to distribute files, such as the one masquerading as a 'google_chrome_old_version_for_pc.pdf'. The primary lure appears to be offering a 'pdf to word app', which redirects to malicious infrastructure.

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://yafferge.ru/award?keyword=pdf+to+word+app+f%25C3%25BCr+android In PDF document text
    • http://nepifumawal.22web.org/22_april_bangla_natok.pdfIn PDF document text
    • http://vuwobide.22web.org/app_store_for_laptop_windows_10.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/6dfcc.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/nunovapoxasosuvawet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_6024ae1d821d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528780/normal_603bf077a24db.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/25313049361.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zebafuvevejol.epizy.com/google_chrome_old_version_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25197fd4-67fa-4eea-8c2e-6ef00eba6005/rufar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc95223b-9a80-4cbc-92f2-50ef875a5d6d/97407713293.pdfIn PDF document text
    • http://pekudus.rf.gd/43567405384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e17425-4fa2-4fb1-8f03-1835f790dba2/vetirawibazakipena.pdfIn PDF document text
    • http://jidoreno.epizy.com/hsbc_bill_of_exchange_form.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/29745665980.pdfIn PDF document text
    • http://vimiromomekex.epizy.com/tesis_sobre_el_aprendizaje_significativo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9b5cfb-7cbe-4392-adf0-6986dc14fd43/python_set_intersection_shorthand.pdfIn PDF document text
    • http://dabemekos.epizy.com/73956071626.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_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 5036 bytes
SHA-256: 5d8ca3bae7c29115ea2d3ccad858df72f026d5f62b077438f7bf7844cd7d6be1
font_01_sfnt_off00010c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 11492 bytes
SHA-256: c2dc6e6285ec608941b4ad2c41759271acf930c9a69fe4f1c4aa7e7e89c9db70

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