Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c981c96471b180b…

MALICIOUS

PDF

75.8 KB Created: 2021-03-17 13:34:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e21fa1763fc82ddb9f3988b0c03f16d5 SHA-1: 2d668f663363c63605866226ecb13970070e5c6a SHA-256: 4c981c96471b180b71dda6107c756a4607653225a329fdf22b52243360d2f1a3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with several pointing to known malicious redirectors or suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=melting+of+ice+sheets+and+glaciers+causes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4474992/normal_60242b9771a4c.pdfIn PDF document text
    • http://2gusevshop.space/towixunibudaby67lp.pdfIn PDF document text
    • https://libexezelidod.weebly.com/uploads/1/3/1/4/131454359/d3479e41b.pdfIn PDF document text
    • http://xekepova.iblogger.org/70548338612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487432/normal_603635b59cad7.pdfIn PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/wilosokateritid.pdfIn PDF document text
    • http://sifegip.iblogger.org/jowavumebavudafunezovaluj.pdfIn PDF document text
    • http://rupuvuk.22web.org/modelo_de_entrevista_semiestructurada_psicologia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5fec806314755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5fe95d35b93f1.pdfIn PDF document text
    • http://hookup157.online/noun_adjective_and_adverb_clause_exercises28a46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeroguru/what_is_tqm_example.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/25169830252.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/66027560178.pdfIn PDF document text
    • http://kapigazezej.epizy.com/which_verizon_jetpack_is_best.pdfIn PDF document text
    • http://savagudalu.rf.gd/split_merge_windows_10.pdfIn PDF document text
    • http://jepisaf.epizy.com/49718764925.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/katejijinabiboviw.pdfIn PDF document text
    • http://wekunogixefol.rf.gd/12432841233.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/adobe_acrobat_x_10_standard.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_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 5288 bytes
SHA-256: 96f52660443f4a98c9d43c34391169954a6fad104d4bf0d8d03f0a9ff4d46818
font_01_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 11152 bytes
SHA-256: 4dd9eb5488b6bdfd42517d32fc0f72bd81384b93afe9fb102c285e1ddd345092

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