Malicious PDF — malware analysis report

Static analysis result for SHA-256 f228b6113cb9f685…

MALICIOUS

PDF

76.3 KB Created: 2021-04-02 09:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7b96c338e8eb2be02ff7ba82a9fdcdee SHA-1: dd7b8c473234ded7bf973e52376371301308ae76 SHA-256: f228b6113cb9f68577dfa18d14d7aa02c768167c85ece4d515c8bceb0ef2b324
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 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://maypoin.ru/strik?utm_term=edtpa+task+2+video+example PDF link annotation
    • https://cdn.sqhk.co/jivonaxadu/CMg5Xjc/bemebima.pdfIn PDF document text
    • http://wdd13.ru/suronodesidegowunix11fcu.pdfIn PDF document text
    • http://zakukamupavi.22web.org/roll20_character_sheet_expertise.pdfIn PDF document text
    • https://sojejizewo.weebly.com/uploads/1/3/4/4/134460985/eb8669862df.pdfIn PDF document text
    • https://lorumotavur.weebly.com/uploads/1/3/4/6/134693112/repivogakotepele.pdfIn PDF document text
    • http://zenigegobub.iblogger.org/tamilrockers_hd_movie_tamil_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/RlibhiT/xenidi.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/5bjeQgi/where_do_adverbs_go_in_spanish.pdfIn PDF document text
    • https://gibonubud.weebly.com/uploads/1/3/4/8/134877094/wifenimefawu-sawujipexu-kukarovosuzo.pdfIn PDF document text
    • http://sexesex.site/chinese_national_anthem_songdcm6a.pdfIn PDF document text
    • http://lg-supportteam.com/kekejamefonevadevavavugp3oa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomedoto.epizy.com/master_of_orion_conquer_the_stars_cheats_deutsch.pdfIn PDF document text
    • http://wisunomimat.epizy.com/tu_bichdann_song_pagalworld._io.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/theres_a_map_on_my_lap_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/tabla_periodica_con_todos_los_elementos_y_sus_nombres.pdfIn PDF document text
    • http://gakefeli.rf.gd/2555281582.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/tres_metros_sobre_el_cielo_-_pelicula_completa_parte_2_dailymotion.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/expanded_plastic_mesh_sheet.pdfIn PDF document text
    • http://wujijurawedike.epizy.com/refojesenojonososiso.pdfIn PDF document text
    • http://wifapig.epizy.com/que_es_una_propuesta_de_investigacion_cientifica.pdfIn PDF document text
    • http://merojupamen.epizy.com/smack_that_tamil_remix.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_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 5292 bytes
SHA-256: ca5575a364d97bbab34461cd7f8a2718a91dc8345ec21a9ccfc54a1d6d6797ba
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 10828 bytes
SHA-256: 90457340a257a458cf8bc897873156883fc467852517ba674b09ff01ab8dd695

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