Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2f2d23330e92b1…

MALICIOUS

PDF

123.9 KB Created: 2021-03-16 01:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 823078a72aeb5bf272f53c660eb3e48c SHA-1: 1363a0ea7cb5fed675268a7f6960e5107ba63d12 SHA-256: bb2f2d23330e92b16123ef60c2823c8c24abade134665f1eec9e0e152e4be46a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. The embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=bus+madrid+toledo+pdf
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/c26819c29691.pdf
    • http://wivupivipewezap.mygamesonline.org/biozone_ib_biology_student_workbook.pdf
    • http://mateguwokalidub.getenjoyment.net/character_counts.pdf
    • https://cdn.sqhk.co/regavebike/Ijbkgex/6101011166.pdf
    • http://raicen.com/why_does_my_pressure_washer_pulsatelxxfz.pdf
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/fobomu.pdf
    • https://cdn.sqhk.co/sadinuko/5jOjjJA/luwetawerepo.pdf
    • https://cdn.sqhk.co/kifavubivelo/bjfoJP8/enviar_sms_gratis_a_cuba_sin_registro.pdf
    • https://cdn.sqhk.co/vakenuda/bJ6ggB2/download_minecraft_mod_world_edit.pdf
    • http://reduslim-italiaoficial.site/islamic_calligraphy_courses_near_mev40ts.pdf
    • https://sineleto.weebly.com/uploads/1/3/4/0/134018219/a5ac0fe8bc16d2.pdf
    • https://lamalirigade.weebly.com/uploads/1/3/4/5/134595912/ratezirexijo_tazabojoxe_jubixapaloji.pdf
    • https://cdn.sqhk.co/tizadufof/gggr1kJ/learn_spoken_english_video_lessons_free.pdf
    • https://cdn.sqhk.co/tubadaluzafu/lzLjijh/nebonogidalapotun.pdf
    • https://cdn.sqhk.co/mepowokugo/jgJQsha/al_quran_malayalam_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://naremijex.epizy.com/79636877406.pdf
    • http://miwexosekapofaj.rf.gd/tawuwujezozutiwajuluvizu.pdf
    • http://feruvine.rf.gd/college_physics_a_strategic_approach_4th_edition.pdf
    • http://pumuroxojab.rf.gd/best_hunting_trail_cameras_2020.pdf
    • http://kugofabafomozo.epizy.com/habitat_for_humanity_dallas_income_guidelines.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_off0001a3c5.bin
2a0015f2b7575e7f80c6c81c556dd30803c6f618b6518dcdbea4a2aa6226f123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3C5 5236 bytes
font_01_sfnt_off0001b578.bin
26a7d518dae8418b881df658d3222861575a703068315b36c5918b97a8482c51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B578 13400 bytes

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