Malicious PDF — malware analysis report

Static analysis result for SHA-256 9551cb71f4e192f3…

MALICIOUS

PDF

75.0 KB Created: 2021-04-08 07:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4e143513702b9d3d0b2f1422335c0883 SHA-1: 8b4edb78299233e1674657da658929462292e037 SHA-256: 9551cb71f4e192f3e142cd596e7bbb1d6ab79cdb518c8f94b42f7e62c61db91e
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, pointing to various domains. This behavior, combined with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent to redirect users to potentially harmful content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://kuzutuzo.ru/wix?keyword=spurs+and+stripes+smackjeeves PDF link annotation
    • http://evgeniy-semenenko.ru/sharp_lc-70le650u_reviewbl0n7.pdfIn PDF document text
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/8323985.pdfIn PDF document text
    • https://vupudotexim.weebly.com/uploads/1/3/4/8/134884591/zodajunofig_zetodipizu_lofawufinupuf.pdfIn PDF document text
    • http://mibemuxagegija.mywebcommunity.org/dolexirekamuvazaxaz.pdfIn PDF document text
    • https://puwisubefubozaj.weebly.com/uploads/1/3/4/5/134516422/jotogesatebujedeju.pdfIn PDF document text
    • http://gigezojiradof.scienceontheweb.net/basic_english_grammar_book_2_free_download.pdfIn PDF document text
    • http://rixanemusijod.mywebcommunity.org/cd4066bcn_datasheet.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/passive_voice_in_english_grammar.pdfIn PDF document text
    • http://bitunowaluf.sportsontheweb.net/analysis_of_incomplete_multivariate_data_schafer.pdfIn PDF document text
    • http://sweetmeet.online/tudage71nk5.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/dojonuta/2807793664.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/interior_design_flyer_template_free.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_51c75374e62f4404a14a799c07a2b762.pdf?index=trueIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_10d98abfb4404018a5095734078cb1cc.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_4bb62b84c3024830bcf01cb7ae58f005.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/parrot_in_the_oven_audiobook_chapter_1.pdfIn PDF document text
    • https://c335e157-9962-4e43-983a-f5fcf491c4e2.filesusr.com/ugd/a09b09_14915e5443ea49e6b5bcadcd97174da4.pdf?index=trueIn PDF document text
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_39ffebe2b14b4090b864a05f8eadc6ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/nice_guidelines_schizophrenia_pregnancy.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_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 5492 bytes
SHA-256: fdb928218a00994545e6644d42b94ca539f27c21fbd0fb02d91dee676d17ec40
font_01_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 11208 bytes
SHA-256: 038c008008ab8de1c3fc5323e9bc4cdc66d8a97b32ab421f91ce063b26a53132

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