Malicious PDF — malware analysis report

Static analysis result for SHA-256 e474f574c72aa4cc…

MALICIOUS

PDF

72.4 KB Created: 2021-04-24 13:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e8780ee739f78041e60c0da26e93831a SHA-1: 7540752a722eff69c250efb5a58554b962172354 SHA-256: e474f574c72aa4cc50d9977205dafc7722e76ceb19d220a369a200dc94c54467
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=what+makes+a+good+quote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489607/normal_6024085702174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_5fe7a1169739f.pdfIn PDF document text
    • http://vorecan.space/petutijufifetipejagamit68g.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/ehhtlyF/78800321912.pdfIn PDF document text
    • http://fit-italy.space/17095509715m9b7s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446635/normal_5ff5ec5dce93d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_6058b5c11cd65.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/nSdjcY9/51879727655.pdfIn PDF document text
    • http://prostotit.site/visual_basic_tutorial_for_beginners_in_hindiapsgq.pdfIn PDF document text
    • https://cdn.sqhk.co/burajugi/iiiheig/zombie_exodus_safe_haven_part_3_demo.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/f5BmJgt/the_academy_the_first_riddle_game.pdfIn PDF document text
    • https://cdn.sqhk.co/zivalutapa/ciehfHS/boxiwifetesazavotegominol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426059/normal_5fd1184b8c25a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_df1d18eb3e5344a8a947ba276ad2eb13.pdf?index=trueIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_c5c1a2bd4fb1460383fc5943ceee15cb.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_08783998812e4dc68d5266400336250f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/326b2ab5-bc2f-4a05-a3a0-ea68fd01ec5e/why_do_we_say_ouch_when_we_hurt_ourselves.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_a24e3aaf22444e668eda8a179a3b603c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91be8d13-cac2-4d24-be18-b19da6af706d/pixosamipesanavivanopuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115ded5a-606b-46d5-ac15-dac67e6ee727/zakigigisokefip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03750a27-2395-47ae-8803-82137a46d7df/11276483821.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_3567aa6cec8b4587995977c6d96be43e.pdf?index=trueIn PDF document text
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_7238a5f0627143e0854477f93609b0a9.pdf?index=trueIn 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_off0000de2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2E 5316 bytes
SHA-256: ddf089cf947dd2ddb17a8bcff79ea8ecbb6b36c75fcabb9a3311b362f03798a2
font_01_sfnt_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 10076 bytes
SHA-256: e1548789eec6b28e2101319885718c53819a768331c33b39825fe9a4f4b846e3