Malicious PDF — malware analysis report

Static analysis result for SHA-256 578ef988939004bf…

MALICIOUS

PDF

78.4 KB Created: 2021-02-03 04:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 11b91e05d89b83f8e2c9738b434df075 SHA-1: 847a98cf2d0d56a4fb547350760e2cf4d63c0ada SHA-256: 578ef988939004bf99f67cbafd0596f653d717a313497fd446e760d42cfd699a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link. The embedded URL points to 'yafferge.ru', which is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and the malicious link strongly suggest an attempt to redirect the user to a phishing or malware distribution site. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=the+12+week+year+field+guide+pdf In PDF document text
    • http://talezoruvaje.iblogger.org/nologobipo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378164/normal_5fcce887168c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465702/normal_5fd7e98dd380e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5feb5f880f97f.pdfIn PDF document text
    • http://fofafik.iblogger.org/guided_tours_of_italy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504870/normal_5ff9ce445d216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388169/normal_6004851cf3cca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402507/normal_6005ad5db72a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379720/normal_5fc57d8f985da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385880/normal_6001d061c722a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489402/normal_5fe823638c730.pdfIn PDF document text
    • http://xekumaluvox.iblogger.org/4370113850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_6011925fb8bdd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xigilozixorod.epizy.com/college_football_sideline_reporter_espn.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/promissory_note_format_india_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/52011675902.pdfIn PDF document text
    • http://wobemiko.epizy.com/pilebazamufelawexunakebir.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/ardour_for_windows_7_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/ganapati_atharvashirsha_in_marathi.pdfIn PDF document text
    • http://dowinoxerirud.epizy.com/bakelite_sheet_pakistan.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_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 5516 bytes
SHA-256: cb023bf997e07390f35ab08e8b4a9fbbffac2b470792f2c0bb98bcc7896ebff4
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 11452 bytes
SHA-256: d54b2c0f9c7519b7148822041aa1c29d790a4058c268945202b9c4c4c87ffae7

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