Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbc21211eb896f3…

MALICIOUS

PDF

82.7 KB Created: 2021-02-22 04:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 45a73362d5b49529a800209733027fa2 SHA-1: 77f72d327db968abd7ca17c8c8c3f7a08577d634 SHA-256: 0bbc21211eb896f3eb0e79312f564cb54ebd2b2892724ac8d4095413728649e4
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The heuristic firings, particularly PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS, strongly support this assessment. No scripts were extracted, but the document's structure and embedded links are indicative of a malicious lure.

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/strik?utm_term=sears+kenmore+dishwasher+service+manual In PDF document text
    • https://cdn.sqhk.co/noxisoture/2ESVggJ/63434280696.pdfIn PDF document text
    • http://bitipusefotas.66ghz.com/xumozar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_602e5a0f41a85.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/d3ifkgi/dojanapudupu.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/iejEigu/mercado_pago_como_usar_a_maquininha.pdfIn PDF document text
    • https://cdn.sqhk.co/birofinud/XC4XCTm/tolusafogepukezagefe.pdfIn PDF document text
    • https://cdn.sqhk.co/satijumok/ciaXCgf/touchgrind_skate_2_hack.pdfIn PDF document text
    • http://pufonorigaji.22web.org/40322041547.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pitefabe.epizy.com/57157116433.pdfIn PDF document text
    • http://webubekesivamuf.epizy.com/tenosalokime.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/bisaya_to_tagalog_dictionary_apk.pdfIn PDF document text
    • http://worizekadi.epizy.com/biodata_format_in_word_for_marriage_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/rogamutixewudazum.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_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 5496 bytes
SHA-256: 7c3504e8be44ab8cdfc3f22902641172513fdc3573948a60ad2afe386cc4d0fd
font_01_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 11308 bytes
SHA-256: bd5421896b107d19d4d0acfac546f2c4ea12f112e1df8171d668692ab69747d0

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