Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e1bcedbbda6d46…

MALICIOUS

PDF

78.5 KB Created: 2021-03-15 16:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 759eb43194029dee2e41107e1f10bf43 SHA-1: 7dbbe014008ee41724acc8edb445e6ebb50ad76a SHA-256: a1e1bcedbbda6d46da6dd3994999002623959a1037aba9d2d6a10fc5393a8226
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating it is part of an SEO link farm designed to drive traffic to malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports this assessment. The primary lure appears to be a fake 'answer key' to attract users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/wix?keyword=periodic+table+trends+turkey+answer+key
    • https://pepevifive.weebly.com/uploads/1/3/4/4/134480859/4259927.pdf
    • https://nusatugob.weebly.com/uploads/1/3/4/8/134865614/vawined_sagewokakoro.pdf
    • https://cdn.sqhk.co/nobixapo/eTgciiz/california_earthquake_1989_facts.pdf
    • http://sesopob.iblogger.org/89806219230.pdf
    • https://taboxataxenigo.weebly.com/uploads/1/3/4/1/134108556/5347080.pdf
    • https://cdn.sqhk.co/buxisinuji/dIARChj/china_visa_vancouver_application_form.pdf
    • https://cdn.sqhk.co/konanetufuda/haiemgc/download_tiktok_without_watermark_android.pdf
    • http://kiduzat.iblogger.org/cuantos_libros_tiene_la_biblia_protestante_y_cuales_son.pdf
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/6303139.pdf
    • https://cdn.sqhk.co/nakolore/ihhhyih/idle_racing_tycoon_car_games_apk.pdf
    • https://cdn.sqhk.co/doporaba/zHgd6QT/dunkirk_harry_styles_character.pdf
    • https://cdn.sqhk.co/popaxutu/TjiijJk/mystic_messenger_webtoon_bookcube_english.pdf
    • https://cdn.sqhk.co/xonipavu/f0ojjX0/word_chums_app_not_working.pdf
    • https://xevezuwojuko.weebly.com/uploads/1/3/0/7/130740392/nawokil.pdf
    • https://cdn.sqhk.co/bagadogod/gfI3ifa/super_bomberman_r_ps4_local_multiplayer.pdf
    • https://tagipuzato.weebly.com/uploads/1/3/0/7/130776724/wewemizav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/memobofilenabon/vulaviwov.pdf
    • http://fusizizugunu.epizy.com/face_changer_app.pdf
    • https://s3.amazonaws.com/tonisefoteka/roxatalamonarogasipal.pdf
    • https://s3.amazonaws.com/poguvelefa/allergy_report_today_austin.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/flame_test_lab_answers.pdf
    • https://s3.amazonaws.com/gimufesajo/whirlpool_cabrio_manual_diagnostic_test_mode.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_off0000f23a.bin
41882f68ee0277d51dca01bfa2b6d66d693fc16c33a1a34fc2e2ac3d50ed8e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 5332 bytes
font_01_sfnt_off00010479.bin
a67302eb72b7123db0053f944a581e11ef54c0463369724e6ad5b1a429eeec38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 11404 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.