Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb9f423e113e4ef…

MALICIOUS

PDF

80.4 KB Created: 2021-04-16 05:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ac98782b26d60ad2beba6f3931be0d0 SHA-1: e65ecdc71c3f39aedd51062569a7679203903111 SHA-256: 2fb9f423e113e4ef7110da0c35936b427bfc4e75be27a0d6c33286882ec6cd4e
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm with numerous external URLs, including one pointing to 'ponafet.ru', suggests an attempt to redirect users to malicious content or phishing sites. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick users into clicking links, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/strik?utm_term=brother+ce-4000+manual+espa%25C3%25B1ol
    • https://cdn.sqhk.co/tibakekavero/hXgdy37/99059171131.pdf
    • https://cdn-cms.f-static.net/uploads/4386613/normal_601a9ece950c9.pdf
    • https://cdn-cms.f-static.net/uploads/4502493/normal_606805c8433d0.pdf
    • https://static.s123-cdn-static.com/uploads/4380229/normal_5fcc9a42b9c46.pdf
    • https://cdn-cms.f-static.net/uploads/4428052/normal_604641970f932.pdf
    • https://cdn.sqhk.co/gikunixa/ifhehjf/32399638670.pdf
    • https://cdn.sqhk.co/nijalemivowo/igYrhfi/ab_inbev_annual_report_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4465131/normal_603bca5a4ebd5.pdf
    • https://cdn-cms.f-static.net/uploads/4393041/normal_5fe690774039f.pdf
    • https://cdn.sqhk.co/vumulevezuf/ajcrxge/burial_chambers_farming_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_13c585bfad504f76b9618305a20b36b0.pdf?index=true
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_37d4dfb30958481c8e221f4b7c7fbd25.pdf?index=true
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_713293bdce5f40d9a5c3484ee2965bbf.pdf?index=true
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_bdaa7e4ea48e4821a0a7063f0c79a840.pdf?index=true
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_117091be8d02442ab4518175cc5f31d6.pdf?index=true
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_d212b780288c4015b828c094387d167e.pdf?index=true
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_f6c80ce8d3554fd4bb86c1728f959b0e.pdf?index=true
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_7c8c14e3bdc843fd85ed49de2aa0145a.pdf?index=true
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_b5685d55c2bf499ea08f3d4d035fc025.pdf?index=true
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_bdedb0d422bc43f2bbebe944092f3504.pdf?index=true
    • 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_off0000f747.bin
8c365b398ee8b2fcaffc86546823541553d2906e426def5b2e7072fd01490a19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 5696 bytes
font_01_sfnt_off00010a40.bin
100a6e74871f2930222dfd163696d1320dc7a7e52fa749a5ff93bd0a7b843f2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 11876 bytes

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