Malicious PDF — malware analysis report

Static analysis result for SHA-256 41092fcfd58a2b83…

MALICIOUS

PDF

77.7 KB Created: 2021-03-27 16:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 66cbf5604e470f5148a0e4782d4dddf3 SHA-1: 203db36aecc0d7d0c8c1767586338634e65aeb49 SHA-256: 41092fcfd58a2b8309680420870b159c2a29ecf824899c2d2f0240c4c9df533c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious 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://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_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