Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd8f73ce5c404fc…

MALICIOUS

PDF

75.1 KB Created: 2020-12-27 13:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8d005d135546a56f1bce70fdb7279f0c SHA-1: ef6bad6b2122163dee711e21fcaec7e1bbd5ae00 SHA-256: fcd8f73ce5c404fcadd3f1177b744960a7a388debf2fabc65bd5c758348b37c9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URL points to a suspicious domain, likely intended to lure the user into a phishing or malware download site. No scripts were extracted, but the PDF structure itself is deemed malicious.

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://cctraff.ru/123?utm_term=i+am+third In PDF document text
    • https://cdn.sqhk.co/sabeludejem/jGjhcid/emergency_alerts_iphone_8.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/uejhhgH/teponow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_5fae2846242aa.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/r4jbgeD/cute_drawing_ideas_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/WqhgdcM/wolf_simulator_games_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/sigagegijej/jbjghgI/art_ceramic_tiles_egypt.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/5XhfhhI/dragon_fly_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/hfI6KKD/t-_mobile_near_me_hours.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2fe2762-503c-4676-a865-7bdd99873de8/derofanevigoxumid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4566787-f480-4a08-b3cd-450f0c97fd58/super_duck_punch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6b6b13-9c23-4006-aa6a-f34f96fe1df4/62772191594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206fb399-e09f-4909-a2e8-ecacc58c0648/57348235267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f8f90a-0017-46d3-8644-73714c182c92/91705096693.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/78897065258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5bd268f-54e3-4876-8acf-269323066baa/51846269761.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_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 4792 bytes
SHA-256: 0606046dea1695dc547f1750cc79f17f3214c8fb33137bad4e1dc9f3b8773a42
font_01_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 11564 bytes
SHA-256: dba8bb3e2d4cb0505bb40672bca0c6034988cf598114850322408ea51347877f

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