Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c733513f98a4ba…

MALICIOUS

PDF

73.6 KB Created: 2021-02-24 23:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b765751f9c0d4d4369298ec2ad5b4780 SHA-1: 8727a49d3cbf0790525ee93cf412ef7623b4ff39 SHA-256: 51c733513f98a4ba3082e557e299e0a5278f50d8efeeca80703a2033e0fabfef
214 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=the+market+square+dog+claims+commonlit+answers'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'https://s3.amazonaws.com/padadutiseni/lajasupobagovetoreka.pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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 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://yafferge.ru/wix?keyword=the+market+square+dog+claims+commonlit+answers In PDF document text
    • https://ladifibefumuxuw.weebly.com/uploads/1/3/4/3/134353250/3e81f395d07.pdfIn PDF document text
    • http://dunetetemob.22web.org/tracing_alphabet_words_worksheets.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/padadutiseni/lajasupobagovetoreka.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/tudepomarulof.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/marshall_dsl40c_tube_rattle.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/78357201025.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/11878690678.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/74721260185.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/23922118199.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/sales_planning_process.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/the_wolf_among_us_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/279798053.pdfIn PDF document text
    • http://vekemifapujev.rf.gd/fogufaxaroxemiwemenen.pdfIn PDF document text
    • http://vibiruguwotugo.rf.gd/wategabuduwuwavuwiparig.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_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 5584 bytes
SHA-256: ccdb42c98d1f157a460af5f4337dad382f6dc5505cc8ea0271a7cffadc24513a
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 10468 bytes
SHA-256: f720410cac749496f2604c9965102e7c64bf4dc8c104ca199b436e1a4cb89cb5

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