Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96c251bdb425949…

MALICIOUS

PDF

76.2 KB Created: 2021-03-27 16:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8fe55bc3a9998b105e4a52d5249f11da SHA-1: db859b858b23a02676c46846dd5813c55c29ef42 SHA-256: a96c251bdb4259496cc2df5c7d62387636a68794d36d196ad9c7bf32c42e1632
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical PDF_SEO_LINK_FARM detection indicating a mass of external links. The ML classifier also assigned a high probability of maliciousness. The primary malicious activity appears to be the distribution of numerous external links, likely for SEO manipulation or to direct users to phishing or malware sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=barisan+dan+deret+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457272/normal_5feb8e146a9d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_602a95e4c9af1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd3226a9c593.pdfIn PDF document text
    • https://vakozumemarob.weebly.com/uploads/1/3/1/0/131070483/f5d7b32.pdfIn PDF document text
    • http://thelandofbadideas.com/fifevuwupomuxivubopufxd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450039/normal_605d66d40ed48.pdfIn PDF document text
    • http://natorg.fun/dilumigotiwxq0x.pdfIn PDF document text
    • https://falojixij.weebly.com/uploads/1/3/4/8/134878909/japole.pdfIn PDF document text
    • http://tamodemuror.getenjoyment.net/caterpillar_annual_report.pdfIn PDF document text
    • http://ericksandoval.com/oxford_picture_dictionary_english0b32z.pdfIn PDF document text
    • https://wakokozetu.weebly.com/uploads/1/3/4/3/134307835/zaxibagifoxojaj_vabovilarojup.pdfIn PDF document text
    • http://chunyoo.com/ic_7805_voltage_regulatorwaoyd.pdfIn PDF document text
    • https://doxabonejanowi.weebly.com/uploads/1/3/4/6/134669922/4233883.pdfIn PDF document text
    • https://fuliribak.weebly.com/uploads/1/3/4/6/134681530/zoxewus.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/resixexi/ccna_security_interview_questions_and_answers.pdfIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_3083a38b317a49759217a12fb7ae25c9.pdf?index=trueIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_3379fba36cf243ad9e7a8c7a8b971826.pdf?index=trueIn PDF document text
    • http://gozudil.onlinewebshop.net/disusozikupoxinalamapap.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/lexile_vs._guided_reading_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/how_to_write_a_script_for_a_video_tutorial.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 5052 bytes
SHA-256: 822f2b0a63813060bc8c6595c6af7e665f8a17446718c3639167d5733b498565
font_01_sfnt_off00010576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 10496 bytes
SHA-256: bbb9fd2bf7a0caa894ba2f67e29fd9b970b588097739d01adb5c551a12b13659

Open this report in the interactive analyzer, or submit your own file for analysis.