Malicious PDF — malware analysis report

Static analysis result for SHA-256 926eddd69d32e33f…

MALICIOUS

PDF

76.9 KB Created: 2021-04-03 05:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c278dd1795185aa55531c7d5e1ae3562 SHA-1: 29ab14c31a73b4d022b1c42171a2d86a88653057 SHA-256: 926eddd69d32e33fc0a3b470b0cc94773afc3bd78f4464ec5a8ae42ca798c063
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' designed to direct users to various external PDFs. The primary malicious URL, https://xezojetit.ru/wix?keyword=ib+biology+hl+study+guide, is presented as a study guide, indicating a phishing or malware distribution lure. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=ib+biology+hl+study+guide
    • https://cdn.sqhk.co/rapawaferew/ghhihfx/sagogaletimugavajivod.pdf
    • http://mikovil.mywebcommunity.org/lg_wireless_headphones_for_smart_tv.pdf
    • http://bachanalytics.com/jomivawopixumojonc1yt.pdf
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/nibasisok_lozes.pdf
    • http://sekelenogake.getenjoyment.net/wright_cooper_introduction_to_aircraft_aeroelasticity_and_loads.pdf
    • https://cdn.sqhk.co/vipabure/ghgeUuD/forajixopukonumefi.pdf
    • https://cdn.sqhk.co/noviraxat/mUvpXhb/dj_name_mixer_maker_app.pdf
    • https://cdn.sqhk.co/wubukuxivupe/eigjjKr/guess_the_baby_pictures_game.pdf
    • https://xobojurum.weebly.com/uploads/1/3/4/5/134599739/tiroza.pdf
    • http://trokot-shtorki.online/58541927848b0qv4.pdf
    • https://vuzirokisex.weebly.com/uploads/1/3/4/5/134576988/resetigopatofiri.pdf
    • http://noxetoporobosek.sportsontheweb.net/16329514090.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xupovobejanam/printable_world_map_with_countries_and_capitals.pdf
    • https://s3.amazonaws.com/napoledunadigo/nutrition_information_peanuts_in_shell.pdf
    • https://s3.amazonaws.com/satudifin/the_good_wife_1987_movie.pdf
    • https://s3.amazonaws.com/lanaladu/7154525259.pdf
    • https://s3.amazonaws.com/senodiw/java_8_free_for_pc.pdf
    • https://s3.amazonaws.com/domegagowevag/30636120927.pdf
    • https://s3.amazonaws.com/baxegezivumi/baking_sheet_with_cooling_rack.pdf
    • http://jujuletofu.onlinewebshop.net/zotubixusudub.pdf
    • https://s3.amazonaws.com/zasepo/sugarewaxa.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_off0000ef25.bin
73a79424b16f337660f4fb73a6e4c4ec173844a489cc8a57bee5ee50dab49a63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 4960 bytes
font_01_sfnt_off00010006.bin
d12b017d69a3a07af3e97b1c9ec91c76026942880fbc30db91dae6444b3ba427		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 10872 bytes

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