Malicious PDF — malware analysis report

Static analysis result for SHA-256 e042667ab0220fd7…

MALICIOUS

PDF

76.7 KB Created: 2021-03-16 15:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76c4f0845163085f5e49bba31d87afb6 SHA-1: 59736b5e5881c452526c472bff73af926def4408 SHA-256: e042667ab0220fd701d8b3ef826ffb27e540e560a36ec4d530e1504881a31e9a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://bologen.ru/award?keyword=buku+belajar+bahasa+korea+pemula+pdf PDF link annotation
    • https://vidisuxusa.weebly.com/uploads/1/3/1/6/131606291/tefivipikun.pdfIn PDF document text
    • https://jarubobukifali.weebly.com/uploads/1/3/5/2/135297267/xusup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443799/normal_5fe6314ccbf68.pdfIn PDF document text
    • https://pepizowa.weebly.com/uploads/1/3/2/7/132711999/9777093.pdfIn PDF document text
    • https://nuvetifozeg.weebly.com/uploads/1/3/4/3/134358797/zurowo.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/da2fdd1492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_6031738c691f0.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/pafiganovavi/netgear_3700_wireless_routers.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/lejegiwadon.pdfIn PDF document text
    • http://diwozonez.epizy.com/atualizao_android_xiaomi_redmi_5_plus.pdfIn PDF document text
    • http://rebubokinore.epizy.com/manualidades_en_ingles_para_navidad.pdfIn PDF document text
    • http://vubudeze.rf.gd/blender_animation_movie_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/boutonniere_deformity_surgery_recovery_time.pdfIn PDF document text
    • http://gusubozavagu.epizy.com/android_adb_location_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/jojurajiwejusul.pdfIn PDF document text
    • http://zakusomob.rf.gd/2011_chevrolet_cruze_owners_manual.pdfIn PDF document text
    • http://bimemelal.epizy.com/missionaries_and_cannibals_problem.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/miniclip_motherload_android.pdfIn PDF document text
    • http://dufatiji.rf.gd/bose_frames_owner_s_manual.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_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 5612 bytes
SHA-256: cfc3a6bb5e2918875f026f52ac289f4b255df3f716d37adae8fdfe77299458bd
font_01_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 10332 bytes
SHA-256: 8697a237595f0120a3d6946f6c5fbee856bf31c863e57ee1140ce2cd3334cd4a

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