Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35047eeeb63ea66…

MALICIOUS

PDF

74.5 KB Created: 2021-03-27 10:22:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c96eb4a9444d175f138536a0c53aff69 SHA-1: ec08c4396844b8822438496963ba180bff937e24 SHA-256: c35047eeeb63ea66412a1421e52e2ab17fb94c388b795edf9db1579291e9d819
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic, with one URL pointing to a potentially malicious domain. The document body appears to be malformed or truncated, but the presence of embedded URLs and the heuristic firings strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=chalte+chalte+video+song++bestwap PDF link annotation
    • https://cdn.sqhk.co/nopavoboriru/za9nif9/furniture_for_minecraft_pe_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/malasexek/QMijU0a/nails_and_spa_brecksville_ohio_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/4qnx5ic/occupational_therapy_assistant_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/gizuluwivew/ggfSgiX/nivubasijuvovoxabat.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/u54higc/burke_and_wills_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/hd1Xgj9/samurai_21_mesquite_nv_coupons.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/dWQlidD/boat_fishing_simulator_codes_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vutenugade/22ahagj/wuzibivowi.pdfIn PDF document text
    • https://cdn.sqhk.co/ribuwikoli/4ugf31A/9107579700.pdfIn PDF document text
    • https://cdn.sqhk.co/birugafomafo/dFxjgs2/zekijep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/jamuduwozenoronoki.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_22a0f7db922641deafd14f0f365874e7.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_4fa790e4fe934a169ccbc1033c3c32cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/12451405145.pdfIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_30d9dff2169f4ee998a04c213c5630b5.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_da079e01865a47a2b0f910e7070ea544.pdf?index=trueIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_ea89e511620744b0bb1f9b4ba2b7723f.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_ff6d099188dd45bab4e89f6d22a38383.pdf?index=trueIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_06f8730c8c564269aec143dc3af98a50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/94146068858.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_off0000e404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE404 5436 bytes
SHA-256: 7221f0a0abc6e146e75f905b07161d707e97873c45d46cc7d91e28943c9827ca
font_01_sfnt_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 11268 bytes
SHA-256: 14e34da69b17f6c8ac2a7383b41661bee24977078b28a0e83702c1e818c498bd