Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87a5ba525416be7…

MALICIOUS

PDF

75.3 KB Created: 2021-03-14 21:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1592de64f4a823f8d8a9bd4ee3fe4d75 SHA-1: 8769b858a75b9481530cdd4ddecab228c539e373 SHA-256: b87a5ba525416be792f89faf9aae7110415d1e6eacfea680229eee0aed3138f1
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external links points towards an attempt to redirect users for further exploitation.

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
  • 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.
  • 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://baarspo.ru/award?keyword=poemas+de+cesare+pavese+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501212/normal_60022071a20e1.pdfIn PDF document text
    • https://navuvosukogeguf.weebly.com/uploads/1/3/1/4/131454151/7854519.pdfIn PDF document text
    • http://snail-case.store/how_to_reduce_file_size_applequdgt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388169/normal_5fe3948e43120.pdfIn PDF document text
    • http://vigastlens.xyz/what_questions_should_i_ask_an_employer_at_interviewa92g3.pdfIn PDF document text
    • https://ronojunigamedez.weebly.com/uploads/1/3/5/2/135297775/3062382.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/7154239.pdfIn PDF document text
    • http://cocobuka3.xyz/89605761826c4po8.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/ginodoru.pdfIn PDF document text
    • http://moscowflowers.online/mamewekipobowigu7p7l4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_6e4e42bdfa634ad988636338c86da1b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/war_of_the_worlds_2020_fox_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/97782553579.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/gijugukixixujavatup.pdfIn PDF document text
    • https://ff4a1b3f-98a2-4a2d-a84d-c53bae18c54f.filesusr.com/ugd/debdc1_cf6e7b8a99e44111991a08d4a24b4041.pdf?index=trueIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_fbcd8af4605e4db38971e12de090746b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/honda_shadow_1100_bobber_rear_fender.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/jagozo.pdfIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_5043c9a147e94fa0b1c83949b9a9fbfa.pdf?index=trueIn 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_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 5328 bytes
SHA-256: f49ec26e867cb0650a9de7067b1b50da6fd073a6c4275a521a29f6cf5383c28d
font_01_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 13256 bytes
SHA-256: 4f42e7db966c6d65dc2acad45faa3915d4e09a0b2af5e4e43bd8d4b2663f044a

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