Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1707ffc4130ebdf…

MALICIOUS

PDF

84.3 KB Created: 2021-01-21 02:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: dc4fef3e523529ae9b425d7e8c6005ae SHA-1: 95c3efa9e9d7474821ed50a6b8180a98e68acc57 SHA-256: c1707ffc4130ebdfc084e1e5bad5cd20ffd67e12f0badd4ca8b2ce8ea44679e2
194 Risk Score
Tags
free-cdn-ebook-manual-lure

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/123?utm_term=kenmore+wall+oven+model+911'. The document body, though heavily obfuscated, contains text related to a 'Kenmore wall oven model 911', suggesting a lure. The presence of a password archive lure heuristic indicates the document may be intended to trick the user into providing a password to decrypt a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=kenmore+wall+oven+model+911 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450351/normal_5fc47419cee3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496148/normal_5fe514ce4a7a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5f8eb0fa13e11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f8ddf53e5dba.pdfIn PDF document text
    • https://site-1176222.mozfiles.com/files/1176222/26165199308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5f8e8d4168a99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422658/normal_60035fbc7969d.pdfIn PDF document text
    • https://site-1197316.mozfiles.com/files/1197316/bhojpuri_video_song_hdvd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369316/normal_5fd05c5f1bff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454430/normal_5fbd5af9d9f9b.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/limepusotanal/39780856418.pdfIn PDF document text
    • http://rexerikilo.epizy.com/vuranarozuvulasobozoj.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/20980337887.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/dell_bios_password_reset_tool.pdfIn PDF document text
    • http://buwumipulufi.epizy.com/dazatakasamowukudopudulix.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/41653585996.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/unir_archivos_grandes.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_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 5120 bytes
SHA-256: b36a22916e2f19c95e73880b063f90078df09454c2d1bb0535df6eeb127e7c80
font_01_sfnt_off00011af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 12088 bytes
SHA-256: c8cb0838df1217dcab992ea0fb5f92872cdfd1b72c93e4df5d5980270de481c5

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