Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6989d2cbac3d977…

MALICIOUS

PDF

70.5 KB Created: 2021-02-15 07:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0259a43e759e30c3e476e058202639e1 SHA-1: 189dfe78afce31a2ef0c75bf1e3274b6e8d687f7 SHA-256: b6989d2cbac3d977c878f62d7c6c0ec372d098f03681413c06f6db95124122c1
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. While the document body is heavily obfuscated, the presence of a malicious redirector strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://crophysi.ru/aws?utm_term=project+budget+plan+template+excel In PDF document text
    • http://poradoit2.site/binomische_formeln_ausmultiplizieren_bungen3zods.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/ehjjb8w/tiralamumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404107/normal_5fe957695dcc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_600f9dba7554d.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/ihxNnsI/football_coaching_drills_for_7_year_olds_uk.pdfIn PDF document text
    • http://itsamorem.com/67036829812q8cly.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/ifhdjyi/patchwork_the_game_for_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412573/normal_5ffadd5a43f1d.pdfIn PDF document text
    • http://wacc-cat.org/wogemaguxewakiguzabinigunibc1m.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/gfhi8ib/farming_master_3d_hack_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366369/normal_5fcbf5a4c84e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_600c63f50da57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450628/normal_5fff77d999d24.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/didowugorokirug/nfl_team_depth_chart_cheat_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/lufasevozawedadogexori.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/mac_android_studio_adb_connection_error.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/diriguko.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/jovodewubesogexijiroraf.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/spring_feign_vs_resttemplate.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/american_college_of_gastroenterology_acute_pancreatitis_guidelines.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_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 5500 bytes
SHA-256: 791172e7b17ce7ffeb5560b877014d84d7e6713e5e5238a77709e72f631beab9
font_01_sfnt_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 10660 bytes
SHA-256: 741074d74f411bc2ef2dd8c016b721bb78c1e0f3529075d82b3f85974372d9dd

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