Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d561c3e587c3ba…

MALICIOUS

PDF

77.7 KB Created: 2021-03-09 09:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30124975c1020578790ff4e6bf4d843b SHA-1: 7ca451a9bd75217dadc1ce1dd751514f1fb51aea SHA-256: 52d561c3e587c3ba559a0f54b85254573005e598a9612c60ce3ab77abbb432f5
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam attempt. The primary malicious URL identified is https://xezojetit.ru/123?utm_term=how+to++minecraft+on+macbook+2019, which is presented as a search result. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/123?utm_term=how+to++minecraft+on+macbook+2019
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fdf0dd0d1bcd.pdf
    • https://static.s123-cdn-static.com/uploads/4368985/normal_5fe4245678ee2.pdf
    • https://sawulazu.weebly.com/uploads/1/3/4/5/134588127/lubogujaduxadosa.pdf
    • https://cdn.sqhk.co/rubogomuweme/hicNijR/74087588764.pdf
    • https://cdn-cms.f-static.net/uploads/4447450/normal_6039832a81ca1.pdf
    • https://cdn.sqhk.co/bulixanejad/AghnBYR/36254649163.pdf
    • https://mitigifagoted.weebly.com/uploads/1/3/5/3/135325532/7f59bbe7.pdf
    • https://cdn-cms.f-static.net/uploads/4391893/normal_5fd8c2a8ea184.pdf
    • https://cdn-cms.f-static.net/uploads/4408333/normal_603d29c8b1ea1.pdf
    • https://cdn.sqhk.co/wefonasifaza/ih0WDif/books_to_learn_spanish_from_scratch.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ae5af18d-83b8-48af-8a39-5481700b3602/93445760753.pdf
    • https://s3.amazonaws.com/bidemewufa/comparison_and_contrast_essay.pdf
    • https://dd70c91d-bff0-4db5-80ca-962f080bd6fc.filesusr.com/ugd/c34eac_c49996c79b774ee4a57ca4a5bfdfd100.pdf?index=true
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_5487716fdeb64a1abc9184820d691d3b.pdf?index=true
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_364e4a62b7c147edb739f5692aa2f820.pdf?index=true
    • https://s3.amazonaws.com/guxosa/25906335009.pdf
    • https://s3.amazonaws.com/pusori/pupinexadosuxinizexi.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/wuvumeroredilufuw.pdf
    • https://uploads.strikinglycdn.com/files/4a461782-9029-4fef-8053-1b18a47d99de/int_x_cos_x2dx_is_equal_to.pdf
    • https://s3.amazonaws.com/janodojivi/10410544209.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f1.bin
8fe9e9c9a4e1006b9d8525cfa547b0826e162c81358f3c39b73e30bc734ee1f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 5556 bytes
font_01_sfnt_off000105dc.bin
4429b65f2c82277618b43756681d52e72e3083c1da64418f085cadd35c70f275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 10316 bytes

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