Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4a883f30cf787c…

MALICIOUS

PDF

80.0 KB Created: 2021-03-26 07:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e017a36cb33f74e00ca30db462d2ed9 SHA-1: 533b790527f293c50bb8a21b44b753e7c5da861f SHA-256: 3a4a883f30cf787c44db118fbe1946c1fec731f96468dc4c9753d88ab678142a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or SEO spam operation. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The document body, though heavily obfuscated, contains keywords related to the external URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/award?keyword=meningitis+bacteriana+adultos+pdf
    • https://cdn.sqhk.co/xevezele/gwjdyUO/what_high_blood_pressure_medication_cause_constipation.pdf
    • https://cdn.sqhk.co/mazonixun/fGNq5JS/football_news_liverpool_echo.pdf
    • https://static.s123-cdn-static.com/uploads/4428342/normal_5fe2c6b21e29c.pdf
    • https://nakupibizotan.weebly.com/uploads/1/3/4/7/134730769/tokakazamasurux-rudogebuvavawu-lixalobusunedun-babajepureluwat.pdf
    • https://cdn.sqhk.co/pazaxefuma/aT3jjie/28379850800.pdf
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/popokuw.pdf
    • http://puxekera.22web.org/what_size_screws_for_tv_mount.pdf
    • https://cdn.sqhk.co/tedavevata/hwN2tLn/real_jungle_animals_hunting_best_shooting_games.pdf
    • https://joxezikawatunex.weebly.com/uploads/1/3/4/6/134699300/sawuse_buzakapaged.pdf
    • https://pujuxuzanebov.weebly.com/uploads/1/3/5/3/135351243/lomamu_wawurapegisosij.pdf
    • https://cdn-cms.f-static.net/uploads/4379236/normal_6022e387de7f3.pdf
    • https://cdn-cms.f-static.net/uploads/4388820/normal_603b3e93c06fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pozokimepe/ramowefejilanabafon.pdf
    • https://s3.amazonaws.com/tomamujuf/78695036456.pdf
    • https://s3.amazonaws.com/sisaxu/76716104697.pdf
    • https://s3.amazonaws.com/kudufigunabi/an_apology_for_poetry_sidney.pdf
    • http://telijurubora.rf.gd/anger_management_skills_for_youth.pdf
    • http://dafawesag.epizy.com/wudujumikinafibedapazalu.pdf
    • https://s3.amazonaws.com/sivanira/days_of_the_week_joined_handwriting_sheet.pdf
    • https://s3.amazonaws.com/falevi/tamil_animation_cartoon_full_movie.pdf
    • http://vifoxakusawe.rf.gd/worawaxinod.pdf
    • https://s3.amazonaws.com/kakekojezutok/assessable_spouse_election_form_explained.pdf
    • https://s3.amazonaws.com/lotibabakuj/pibezivusarivozojofiren.pdf
    • http://feletik.epizy.com/59052934709.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa10.bin
abc8e217ef7ca44e8baa423fc39f5d396d7e068279624479d601a3553a75507e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 5468 bytes
font_01_sfnt_off00010cc4.bin
201dfae89351d2554b9301cb8cfd77fda9fb29750b3bfa7cf5c508eb9149e8da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC4 11700 bytes

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