Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d022723fed7636…

MALICIOUS

PDF

70.2 KB Created: 2021-03-04 16:31:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3e55249b6bf6b038d965812322c8ee0b SHA-1: a949a962324aaa30dbee73c44beae7a87743ea9f SHA-256: 63d022723fed763645fa598942462b52f3e2e487e8898f49a98b4812fbdb6cb8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary malicious URL identified is https://soxebez.ru/award?keyword=folk+culture+vs+pop+culture+examples, which is likely used to direct users to malicious content or phishing pages.

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://soxebez.ru/award?keyword=folk+culture+vs+pop+culture+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473322/normal_5fd228a92574e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_6028027a3bf55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_601b2cc6ddcfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_115da368f207447c85bd96963d51f02f.pdf?index=trueIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_f0f61d62c34d48ffad0ed16efdbc4567.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d5824fc-39de-418e-a3b2-66ef675ddbc1/85487370228.pdfIn PDF document text
    • http://tawazowifow.rf.gd/dr_br_ambedkar_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d910dc1-e3e5-4790-86be-58f937381ea3/zixud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56d491d-3f5e-4744-9c4e-0075937d24c3/89551684116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3479a0c1-cf3c-4b9f-ac26-70e4ff206b3a/pinejemudatidobix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1bbf6ce-2e9f-4d79-a3af-a657fca3b750/antiderivative_of_csc_cot_x.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/nulufejoterazovixudef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ae014c-8dd3-4fc0-a714-2be1707538a1/how_to_draw_isometric_view_in_autocad_2d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775246ab-de95-45a6-9907-566f7671c7ed/batman_the_dark_knight_returns_joker_voice_actor.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/mepofalom.pdfIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_c9ab1b2b31bc4c9fa5f4233cd21c6a97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce85828-2541-434b-b3df-4ab2607ae316/74745155916.pdfIn PDF document text
    • http://vufuwuxe.epizy.com/free_able_2020_calendar_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/avg_free_antivirus_for_pc.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_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 5228 bytes
SHA-256: 3a031a21f0cd66339f0231f21cff93ce2fa6504e0a1a4b8bcb26308da6a28461
font_01_sfnt_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 10492 bytes
SHA-256: bfd239e4aa16daa081b6a997dda7d8f8d185875080394ac48f1c281497af7f26