Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bca85695c50e5fa…

MALICIOUS

PDF

71.7 KB Created: 2020-12-14 02:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ff753286e6c5115a934ecdf2a6e6e2b9 SHA-1: 1dd85cbd0caa9bcf788fd7151e9b98c891408da8 SHA-256: 9bca85695c50e5faad25e5b285af7acb7c0a42855adf0a01b95c564b1fb4c871
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its user-facing content, but the presence of numerous external links is a strong indicator of a link farm or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=speed+out+screw+extractor+manual In PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/sujukokudevaf-ruboriw-bulipurajo-parebedi.pdfIn PDF document text
    • https://zeradukiw.weebly.com/uploads/1/3/4/8/134883462/6784736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5fadd0b0b148d.pdfIn PDF document text
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/7507396.pdfIn PDF document text
    • https://xabopefasuliwik.weebly.com/uploads/1/3/4/4/134445681/b1d9f.pdfIn PDF document text
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/934583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412773/normal_5f9d30cd19386.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/rejiner/savupudubizuzewuwov.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/virtual_microscope_lab_cheek_cells_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/3_times_table_multiplication_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jaburirarov/nosupu.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/business_report_writing_practice_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/garubetajilikuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/dead_space_2_dlc_trophy_guide.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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 5484 bytes
SHA-256: ff6c1d64d378337e3964bffcbe84af7a70a938ae15016d765e54f56795e9fffd
font_01_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 10644 bytes
SHA-256: 7b747510c04b6c708618fd5e0fa929531d97d6f9745a173099c072aa188babc0

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