Malicious PDF — malware analysis report

Static analysis result for SHA-256 022f026e9528cf3b…

MALICIOUS

PDF

77.6 KB Created: 2021-03-22 01:58:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 86a80477febd8775575da255933b108d SHA-1: 893580ce6a348c2ee4762164f5d7463d1f9a62b4 SHA-256: 022f026e9528cf3b1467e4dc04a05e2dee65d6a0feb89fcfe272fd4c1e21bd90
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document that impersonates Microsoft to phish for credentials, as indicated by the 'SE_BRAND_CREDENTIAL_PHISH' heuristic. It contains embedded links to malicious redirectors, such as 'https://crophysi.ru/123?utm_term=loan+agreement+template+word+format', which are designed to lead users to further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nekuferalota.weebly.com/uploads/1/3/1/4/131406939/576672.pdf.
  • 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/123?utm_term=loan+agreement+template+word+format In PDF document text
    • https://nekuferalota.weebly.com/uploads/1/3/1/4/131406939/576672.pdfIn PDF document text
    • http://rakuxijewimafud.22web.org/enzima_aldolasa.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/30562949389.pdfIn PDF document text
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/3482fb7ffc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4d57ad-f1ba-4c7f-9258-3452267dc74c/77054178078.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/a_technique_for_producing_ideas_by_james_webb_young.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/matchless_hc30_manual.pdfIn PDF document text
    • http://wugorasu.rf.gd/eachine_e58_user_guide.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_697e40a44fc647de8fe3b6dc97ebe87b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/jedi_outcast_bespin_platform_walkthrough.pdfIn PDF document text
    • http://zapizuw.rf.gd/nebafizuxa.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_15e5cf0e8af5442aa99b69ee129c2243.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_224524f93b3c448a8d52b7523737fe5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/936b65bd-6727-48f0-9405-08c338bd9864/a_brief_history_of_the_romans_2nd_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/40372258749.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/misutusavi.pdfIn PDF document text
    • http://nisinukodepafix.rf.gd/company_tax_return_form.pdfIn PDF document text
    • http://nipimixo.epizy.com/ryobi_router_guide_bushing.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_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 5216 bytes
SHA-256: 4e106d64a516fcd3106d218778ca9acedc103bfb3eb56f3fe56e0079f6cbb5ba
font_01_sfnt_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 10756 bytes
SHA-256: 5bf261d31c1804b679d8f93ae31347f190adb6cf5a90aa997ac685d024d9f235

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