Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb477f227e0a2715…

MALICIOUS

PDF

81.0 KB Created: 2021-03-09 05:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3550b4a6041c81c5c81b31fe5e867cd SHA-1: 18aa157c7f1e6fbcea62c267d26ce911bf5cdda2 SHA-256: fb477f227e0a27156e77eca377d8b1ce43b314e8d56620b6a4581fbbe8028ffb
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to SEO-optimized content. The primary URL, https://jacksth.ru/wix?keyword=transcontinental+railroad+worksheet+pdf, suggests a lure to a website disguised as a worksheet. The ML classifier strongly indicates maliciousness, and the PDF structure with numerous external links points towards a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://jacksth.ru/wix?keyword=transcontinental+railroad+worksheet+pdf
    • https://cdn.sqhk.co/worekoxe/hcjgfjh/kobukurolavuji.pdf
    • https://cdn.sqhk.co/woselukafo/hdejiCT/piseb.pdf
    • https://cdn.sqhk.co/kidurukazag/ibhefD6/naruto_ultimate_ninja_blazing_mod_apk_offline.pdf
    • https://solakozejifu.weebly.com/uploads/1/3/5/3/135347449/sefomalov_vukux_zamupimobe.pdf
    • https://cdn.sqhk.co/butemobe/gjihbpg/48284740761.pdf
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/2683778.pdf
    • https://cdn.sqhk.co/xugosovemi/xjhrD4A/boomerang_maker_boomerang_video_maker_free_download.pdf
    • https://cdn.sqhk.co/gabisolovima/fChbjii/jungle_adventure_3_hack_mod_apk.pdf
    • https://cdn.sqhk.co/devisofage/hfgija3/46045046151.pdf
    • https://cdn.sqhk.co/mixaluwekitu/cjbgfhV/songs_mashup_maker_app_for_android.pdf
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/d9b62cd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_c435b8a87fcf4e478cb99f9c116baba3.pdf?index=true
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_67efca08d7bc4135b6d6178a1a91342e.pdf?index=true
    • https://s3.amazonaws.com/medaliwifufugel/upgrade_windows_7_free.pdf
    • https://s3.amazonaws.com/ropidadegaxut/languages_online_answers_french_grammar.pdf
    • https://s3.amazonaws.com/dukavunivifa/xunixatu.pdf
    • https://s3.amazonaws.com/xelimewat/baar_baar_dekho_full_movie_openload.pdf
    • https://s3.amazonaws.com/gonima/blood_transfusion_guidelines_2019.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_161826c9695f4d948a6870096b655b65.pdf?index=true
    • https://s3.amazonaws.com/zufaxepixiguxax/79491661332.pdf
    • https://s3.amazonaws.com/furunumaroxun/how_to_calibrate_flysky_gt3b.pdf
    • https://s3.amazonaws.com/zaxefemebidaz/94448253762.pdf
    • https://s3.amazonaws.com/wovugi/11533148898.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_off0001014a.bin
0fde65f8d342b0d1e8be5b6106c0cf7eb763e1515630c083b0b6f85dc40d4bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 5348 bytes
font_01_sfnt_off00011386.bin
ccb4c2ca98edf96d09a0cf120dbe1b2905eb8dee4489c12b52be30a84c50263c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 10136 bytes

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