Malicious PDF — malware analysis report

Static analysis result for SHA-256 45336846ebf96949…

MALICIOUS

PDF

87.8 KB Created: 2021-03-21 12:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a55ac79cc186d88fc44b3f8e493872bb SHA-1: 96f9e5eafe365ff4372ea162a87249d5d249d3c3 SHA-256: 45336846ebf969498dd77eff81a183a8cbfedfca566d6f8405a5a18816aee7d2
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'Ubuntu unleashed 2017 edition pdf', directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/wix?keyword=ubuntu+unleashed+2017+edition+pdf
    • http://afracheat1.xyz/what_is_the_algorithm_to_solve_a_2x2_rubiks_cube7n9w4.pdf
    • https://dapalaboz.weebly.com/uploads/1/3/0/8/130874192/mulap.pdf
    • https://cdn.sqhk.co/lomasamube/hbKxhiR/at_t_u_verse_package_channel_list.pdf
    • https://cdn.sqhk.co/xetokive/gjGGifA/xizabokugunusofuz.pdf
    • http://kolekewoni.mywebcommunity.org/digital_fortress_audiobook_download.pdf
    • http://omoikiri.info/brief_wondrous_life_of_oscar_waouagv8.pdf
    • https://kavixonew.weebly.com/uploads/1/3/4/5/134592395/bafadot-bopin.pdf
    • https://fizabogozof.weebly.com/uploads/1/3/2/8/132815807/vidomofugenubaran.pdf
    • http://nubilofanekib.mygamesonline.org/91502374900.pdf
    • https://poxosopetijonaj.weebly.com/uploads/1/3/1/4/131453527/2504230.pdf
    • https://cdn.sqhk.co/fagaxirupunu/gevhjV3/61364217525.pdf
    • http://xutifufaxe.mypressonline.com/abridged_english_novels.pdf
    • https://cdn.sqhk.co/tikugosedik/Oc4hb72/english_love_songs_mp3_free_download_valentine.pdf
    • http://xagakojitogiva.getenjoyment.net/10851978489.pdf
    • https://cdn.sqhk.co/wodelaganav/npHgcaM/galway_football_championship_draw_2019.pdf
    • http://xuzerujagojagip.scienceontheweb.net/dell_precision_t5500_motherboard_form_factor.pdf
    • http://sayfelengs.space/87777870371dp1ac.pdf
    • https://cdn.sqhk.co/vumuwuxa/aS7iGBe/nfl_sunday_ticket_promo_code_2019.pdf
    • http://wordwild-store.com/prisoner_b-3087_character_descriptionn9st9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zalisujezajaje/laveriwosaxapagajafalite.pdf
    • https://s3.amazonaws.com/dipafuxe/mixosusonodesoxovata.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010899.bin
0f619c53e4678151449585b67456ca25a4eec95ed40799c7b5e3e0815e7527ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 5452 bytes
font_01_sfnt_off00011b26.bin
7c754fa28aa08c7f1c9eb8d00eda1ecac4e6d87aac2307567da903a72936c8aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 11868 bytes
font_02_sfnt_off000143c4.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143C4 4324 bytes

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