Malicious PDF — malware analysis report

Static analysis result for SHA-256 923cebec507426a1…

MALICIOUS

PDF

78.8 KB Created: 2021-02-21 04:23:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 64b686c8202474f16f1ca768b461a170 SHA-1: 29b614c38f6f438599747cb587170748ef626a11 SHA-256: 923cebec507426a1db2b5434817a4d7b3acdcd9a7016501e45392909a81539a7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=epson+event+manager+cannot+connect+to+scanner+windows+10'. The document body, though heavily obfuscated, suggests a lure related to Epson event manager issues. The 'SE_CLICKFIX' heuristic indicates social engineering tactics to trick users into executing commands, which aligns with the redirector's purpose of leading the user to a potentially malicious site.

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/strik?utm_term=epson+event+manager+cannot+connect+to+scanner+windows+10 In PDF document text
    • https://cdn.sqhk.co/nogorodizet/jjeUgeD/my_cloud_setup_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/TPUzjeN/28081014676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_5fffeb556845b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_600b2a5ab663e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5ffded08251b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fed802f07b49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404103/normal_5fffc37e791e7.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/kzigIYy/tower_defense_zone_2_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387232/normal_5ff3b461c37b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_5fd7d514b43b1.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/hijjWRm/bomepogutunilopekadugiv.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/Xfhht1P/rugby_world_championship_2_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_601cb8fbb99c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_6002c27e909ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_602e23b0f0b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476750/normal_5fd5fac261994.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/jhhbhd5/52126393605.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/FmhcIK9/best_berlin_travel_guide_book.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/ihjhdhb/slide_away_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/icigibK/calculator_app_for_ipad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 5664 bytes
SHA-256: 46fe700b123975f08078c0d9cbcc12190b07325dc94e5c53be8addaf1bc35cb4
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 10512 bytes
SHA-256: 634edf5897000276b6aac39b84c0308989e7aed2f0a08061f69fa48da28db23d

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