Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3ee245f9f9517c…

MALICIOUS

PDF

75.7 KB Created: 2021-04-05 21:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0ecdb093098d41f8d503946263da3159 SHA-1: 4f78fd654603fdf5d76110c612cf115096c712bd SHA-256: cd3ee245f9f9517cba1f2bb46894a828ec05a2c077ec89e689a12124a06f043f
214 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many URLs pointing to potentially malicious domains. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to 'yafferge.ru' as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=ense%25C3%25B1anza+aprendizaje+definicion+pdf In PDF document text
    • http://priz24.site/629621041100cjl5.pdfIn PDF document text
    • http://yellownatural.space/apicultura_embrapah8l25.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/jomijenowezufew.pdfIn PDF document text
    • http://top-odejda.com/why_does_my_washing_machine_drum_not_turnqd3v2.pdfIn PDF document text
    • http://littlenat.space/what_does_rhetorical_style_meanxdxbb.pdfIn PDF document text
    • http://zogometemo.sportsontheweb.net/catia_v5_tutorial.pdfIn PDF document text
    • http://begetus11ppz.xyz/dell_s2415h_driverfpje0.pdfIn PDF document text
    • http://pasetbs.xyz/chemaxon_marvin_sketchdlrrr.pdfIn PDF document text
    • http://tuxesimufimiti.mypressonline.com/how_much_power_does_a_mini_freezer_use.pdfIn PDF document text
    • http://1xbets-reg.site/19396128420ce8b3.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/lofese/dupabosutetome.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/go_math_grade_5_answer_key_homework_book_chapter_7.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/camtasia_studio_8_windows_10.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_328e6f67d3f84bc6934ebe29f8a771cd.pdf?index=trueIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_6ffcb75cf034423e939f3485ecb04563.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patilawasu/78360680249.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/cast_from_chrome_to_android_tv.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_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 5412 bytes
SHA-256: 3ccdc3a997d1c376b7e8ef4c45cd2832a76602bfb23b7d6f2a56ae81c02f3cc9
font_01_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 11516 bytes
SHA-256: 100c732784fc1921cbe59080986c96b8caa0f5756ec31c115980705f66a26251

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