Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2b3af1ccd1ba71…

MALICIOUS

PDF

68.1 KB Created: 2021-03-14 15:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ac41dcfa361d52d683df6b9846841ba8 SHA-1: 5b3489a509f76b86b32f32a8d0e5aa0af7419b19 SHA-256: 2c2b3af1ccd1ba71538c3133f6f275eda9797a8ed222ebec378ba1c0f8336615
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to statistical concepts, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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/strik?utm_term=how+to+find+z+score+not+on+table PDF link annotation
    • https://foxesusonixuna.weebly.com/uploads/1/3/5/2/135298742/kajus-webasowugix.pdfIn PDF document text
    • http://igcopyrightverify.com/mulezivuzatovame61of3.pdfIn PDF document text
    • http://metryck.info/76610567059gi7jz.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/BjbHOhh/retroarch_ps2_roms.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367625/normal_5febac652a288.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/who_said_there_will_be_rivers_of_bloodoqkk6.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/jjBgjie/jepuselenogevepez.pdfIn PDF document text
    • http://vigastlens.xyz/how_to_use_an_ergobaby_infant_insert3f56w.pdfIn PDF document text
    • https://kuxadituva.weebly.com/uploads/1/3/1/3/131380841/lagemezuzekedon_volewovotopi_titaza.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/ajdLhhf/kumudutixo.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/ihibgi0/gizmohub_app_icon.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/what_is_the_multiple_intelligence_test71ate.pdfIn PDF document text
    • http://bunnygummy.ru/48_laws_of_power_free_download_androidh399s.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/aCSXthj/air_hockey_game_code._org.pdfIn PDF document text
    • http://rezltml.xyz/8307584122bkhyn.pdfIn PDF document text
    • http://youralteragoods.com/tazunimosuzerubotifetiev13y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_601c8bd52eaea.pdfIn PDF document text
    • http://sweetygirl.club/how_much_is_a_2015_honda_accord_ex_worthj9e1q.pdfIn PDF document text
    • http://newberginvestmentproperty.com/sample_scantron_answer_sheet_for_letatysc.pdfIn PDF document text
    • http://naturka.space/graceful_wendy_mass_freeevbum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_603cc5bfeb6d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_60329ec8229bb.pdfIn PDF document text
    • http://nikecortez.net/como_hacer_un_panel_solar_casero_para_cargar_celularesrosfr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 5260 bytes
SHA-256: 1c97439abc4aa0c3ff12bf53ed55f66a56f1ff6a9cba6333625a5e76e1346c28
font_01_sfnt_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 10700 bytes
SHA-256: 04dedd4f72ca942fe2c1c3e1b1f96a663f663a3b5d46bfa3cb143521c915a788