Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b34d4b846c79eff…

MALICIOUS

PDF

81.6 KB Created: 2021-02-25 19:29:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1a5fd804ba75636f4abe80931f06ee26 SHA-1: 731849f08c791847a670742f229c745732ffb9a0 SHA-256: 2b34d4b846c79effaaa6fbfff516bc1264303d4520eaa622e43fce51f7cd21da
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URL likely leads to a phishing page or a download for a second-stage payload, disguised by the document title.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/123?utm_term=is+homework+good+for+students+or+not In PDF document text
    • https://cdn.sqhk.co/gusiloxi/ihfghgf/50457835224.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/hhicYia/tapezerobozefazogiba.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/WECmeia/61003028459.pdfIn PDF document text
    • http://creditscorehelp.info/24807834579t40fw.pdfIn PDF document text
    • http://heymama.store/bozawoupas2.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/leteraxewe/24412428153.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/printable_butterfly_worksheets_for_preschool.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/berebaxuz.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/how_to_describe_cold_wind_in_a_story.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/fake_blood_cancer_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/baidu_browser_apk_for_pc.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/does_chick_fil_a_hire_at_14_in_new_york.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/tuwawap.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/96519006172.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/dologemezazu.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/tarupoziwomirutekumamasov.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/2002_ford_sport_trac_tire_size.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 2940 bytes
SHA-256: 72b815926571ed76dcdb15ba0f925f8be737f518649be50e3ea36e0fc125b231
font_01_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 5004 bytes
SHA-256: 3b44d6a1003201fb4209a8ebff72ad17329dbef0239e209693ceb07f83b8736a
font_02_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 10208 bytes
SHA-256: ccf77c1180b020c37457e5a0412b46b5dede9a1a62fbb0ed89326750afeefd2e
font_03_sfnt_off00012a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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