Malicious PDF — malware analysis report

Static analysis result for SHA-256 16199b83ec664fc8…

MALICIOUS

PDF

77.8 KB Created: 2021-03-31 15:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f17f1414e3a422db6e08202c9d377c83 SHA-1: d80a01c278edc0af0a249f57b55a383a292d71d5 SHA-256: 16199b83ec664fc8d111432bcb88ba001ffc0aef13f8705c0fff0aa1cd930bad
186 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, with a primary URL pointing to 'fokemale.ru'. This suggests a phishing or SEO spam campaign, aiming to redirect users to potentially malicious or deceptive content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://fokemale.ru/wix?keyword=tour+guide+cover+letter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422163/normal_6018e473488ab.pdfIn PDF document text
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/470b9c7c5c96a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_602e4ee37871f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_602e14c9bf3a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_6019c0e0354f4.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/e78be57b82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_5fd3be757b5d1.pdfIn PDF document text
    • https://gujibukogise.weebly.com/uploads/1/3/1/3/131380045/lotab_risili.pdfIn PDF document text
    • https://cdn.sqhk.co/sexasegavon/baXhNni/smallest_object_in_prop_hunt_fortnite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_6058395f5c4d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468838/normal_600a560a99693.pdfIn PDF document text
    • https://cdn.sqhk.co/nogugojuri/ciaghV3/make_fold_up_table_legs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_6009bf37bfe6b.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/gcRgdop/craftsy_bernat_blanket_yarn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407997/normal_5fd08c3cd9c16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385617/normal_6009652ae7879.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/ggiNEsB/free_ringtones_2020_music_ringtones_and_sounds.pdfIn PDF document text
    • https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/f55db2fdba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_602882bb47d5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_60132a7e9a5a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/47947ec3-c833-498b-993e-2857c6a8dfa0/official_gre_quantitative_reasoning_practice_questions_volume_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad717561-537d-4fe2-9b62-a5da8952cd1b/mibagusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7554c873-47b2-4d1a-846f-e13065b490d0/georgia_drivers_ed_online_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1667e83d-2ce4-4b7b-aece-bc6a4f5501f7/71867049393.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_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 4728 bytes
SHA-256: dcbc2ff30980dbb0692f82957d4e153c9fcf81481e4fd2a50f9c71a1a5c01fdb
font_01_sfnt_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 10720 bytes
SHA-256: 13ade5d86464a897072b1dd5ad759277656d4d805d2ee554716926ff4e88628f