Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbec29f4387c1ff…

MALICIOUS

PDF

72.6 KB Created: 2021-02-17 04:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3ef63e843be0f7fedb66288d0e2f0c80 SHA-1: 6811450541e72c8b9a9208ad70a5879806ebf451 SHA-256: 4cbec29f4387c1ff50f3f28e08a158ce05dfa7743d04de7f7244e1d3ef867762
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/'. This indicates the document's primary purpose is to redirect users to potentially harmful websites. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the embedded URL is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=garmin+vivofit+3+activity+tracker+black In PDF document text
    • http://biomaniks.website/honda_astrea_supra_100_manual331ye.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_60250fe3a5b62.pdfIn PDF document text
    • http://new-volosi.ru/febewilixuwulibugkaspk.pdfIn PDF document text
    • http://hookup154.site/moxisifuzixavijipelopumix7byq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403948/normal_5ff263fdd61d7.pdfIn PDF document text
    • http://rankingcoach-seo.com/20859040031dm3s2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/8840019856.pdfIn PDF document text
    • http://zofutigo.epizy.com/76245952734.pdfIn PDF document text
    • http://gusubozavagu.epizy.com/android_adb_location_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/xezogomutiwabuwikalo.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/bioresource_technology_reports_indexing.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/button_holder_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/15506622190.pdfIn PDF document text
    • http://womiwinimubejaw.rf.gd/snow_white_and_the_huntsman_names.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/tamituniligesani.pdfIn PDF document text
    • http://nijetazum.epizy.com/anatomy_of_human_body_books.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/nobarefo.pdfIn PDF document text
    • http://zumaxupuvu.epizy.com/construction_non_compliance_report_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 5196 bytes
SHA-256: 312a4ee630b5edb85f59317fb080eb46bd093abdfd02ec95c420274b4ff620f7
font_01_sfnt_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 10760 bytes
SHA-256: 08034ea47a62b4e785241c346cf61e19a1709932404675c8fa60b5f5c9423656
font_02_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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