Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c32c00012c182c…

MALICIOUS

PDF

104.1 KB Created: 2021-02-15 21:37:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cec924d4c6c17e6d09aa5a4261281029 SHA-1: f9257a90f0e56c54809210d325094ae543978228 SHA-256: d2c32c00012c182cb59169663a47a64743899ec25bc869985e482b996ab2f385
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified links to known malicious redirector infrastructure, and another flagged the PDF as a link farm. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded links suggest an attempt to direct users to potentially malicious content or phishing sites.

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/strik?utm_term=jersey+shore+house+florence+italy+address In PDF document text
    • https://cdn.sqhk.co/joxezexukub/ekhs8qU/40112345943.pdfIn PDF document text
    • https://cdn.sqhk.co/jepipovi/XAtmieK/vulovuwilopejegokavajet.pdfIn PDF document text
    • http://thehensleys.org/arjun_patiala_full_hd_movie_filmywap5wdms.pdfIn PDF document text
    • https://jaxefosizi.weebly.com/uploads/1/3/6/0/136083017/1749038.pdfIn PDF document text
    • https://nuzewotamomumaf.weebly.com/uploads/1/3/4/7/134701518/876ed7afbf40.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/3114373.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hahbcOF/30171813440.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/Mjc9kjh/mx_player_codec_armv7_neon_1._13._0.pdfIn PDF document text
    • https://cdn.sqhk.co/dumotometapo/idgfkjc/7130727069.pdfIn PDF document text
    • https://cdn.sqhk.co/feneradebeza/R1ntQ5F/home_pony_game.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/eiadw7D/guess_movie_picture_game.pdfIn PDF document text
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/juzuzivetomepavasubu.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/nhhSgjx/general_motors_financial_analyst_salary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pinezininefos.epizy.com/38282748881.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_off00015471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15471 5200 bytes
SHA-256: 77dd6aca7ae19d286a6f79fefae95b6734a061f887d1e977fa5df36461cbfef4
font_01_sfnt_off00016623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16623 14584 bytes
SHA-256: 7d040cc7564baabd74e3b92e27d4014f29810fe1e043fd701fb4ace795353501

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