Malicious PDF — malware analysis report

Static analysis result for SHA-256 614e643adc9287c0…

MALICIOUS

PDF

64.0 KB Created: 2021-02-19 05:59:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8aa74d9f8d0fda7a10bb8cf53ee87eb4 SHA-1: 1de9005c8477f2f03aac55fb4f8200481f1f06c9 SHA-256: 614e643adc9287c00720234bfa72b07c1d0fb5aba28cbb1fab5ec7c452310c2c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains a malicious redirector link that masquerades as a ringtone download, but is intended to lure the user into downloading a remote support tool. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest a phishing or social engineering attack, likely leading to the download of a second-stage 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/wix?keyword=baby+laugh+ringtone+nokia In PDF document text
    • https://cdn.sqhk.co/jukelifawap/jaiiyge/komur.pdfIn PDF document text
    • https://cdn.sqhk.co/duzemata/biihjf9/splashtop_streamer_exe_download.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/v1wjfib/4682491626.pdfIn PDF document text
    • https://cdn.sqhk.co/kubasovusi/Okiaejj/91468063854.pdfIn PDF document text
    • https://cdn.sqhk.co/nubavojek/fifeVqZ/kujawosigimoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5fdaef4f5c127.pdfIn PDF document text
    • https://cdn.sqhk.co/telivagawu/dicihn2/81217205332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_600c4d9b21b5c.pdfIn PDF document text
    • https://cdn.sqhk.co/pivifilogopa/0jggfy8/61071407039.pdfIn PDF document text
    • https://cdn.sqhk.co/kesusevuzep/ajj0Son/turbo_drift_3d_car_racing_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/gd29kgh/slingshot_stick_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/seranowe/z4ghhak/2574957539.pdfIn PDF document text
    • http://vekvelo.ru/63302152439uaokj.pdfIn PDF document text
    • http://jumpfs.space/vegaganaxudonulujafxlwuo.pdfIn PDF document text
    • http://alfa-quest.ru/nsw_trackworkb11ru.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB360 5004 bytes
SHA-256: c404cc9ad1afb879231713baa38fd2d3d638296e30b4c40f7561416daa6a753f
font_01_sfnt_off0000c462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC462 9556 bytes
SHA-256: f0095fa85ad907e2d5597432424fe2ff49bfc73b07be3ada4d3834582a7489b7
font_02_sfnt_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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