Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9ed4994af9531e…

MALICIOUS

PDF

76.7 KB Created: 2021-04-16 18:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 23ee1e4955f99bb2e62c5d59fd386a74 SHA-1: 98b1977bc4673b985e194f6c3108b216bd3d6ad3 SHA-256: 2b9ed4994af9531e2bd574bc0848ae620bb85ef6ca604751538db0a6e1f72ce8
186 Risk Score

Malware Insights

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

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 0.9990

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/strik?utm_term=how+do+you+find+cash+dividends PDF link annotation
    • https://cdn.sqhk.co/komagiju/dUJiihh/bizajudelosawug.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/b0401bc195e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_6011e055ced7d.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/eghJQtx/hello_kitty_fortune_cookie_maker.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/xamoxavuwemeduvolel.pdfIn PDF document text
    • http://bulenamoj.22web.org/spondylosis_lumbalis_adalah.pdfIn PDF document text
    • https://xuzowezawejinat.weebly.com/uploads/1/3/4/3/134378303/03d410c88e.pdfIn PDF document text
    • https://cdn.sqhk.co/kerodamajop/hjAjhCa/amc_30_olathe_kansas_movie_times.pdfIn PDF document text
    • https://fexagoresex.weebly.com/uploads/1/3/4/3/134337575/xexiseselokomu_lixap_mukoko_wofeki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427313/normal_5fec20c4ba85d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468534/normal_5fded60cca947.pdfIn PDF document text
    • http://wawimetuboze.iblogger.org/victoria_martens_autopsy_report.pdfIn PDF document text
    • https://rejowuboxobe.weebly.com/uploads/1/3/2/6/132680789/veratarejugatad_lonubu_bunuxonila.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/jMihDif/police_car_simulator_game_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/efjcWid/traffic_jam_speed_crossword_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagojovo/Yidgjgd/dipedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_60690cfa68d43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_604d5e677ec6e.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/hbjhgdN/video_player_app_for_android_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/hhbhia5/silasasuzinulisukagerewe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zemoxatovasoga.rf.gd/auto_call_recorder_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/gujarat_samachar_today_newspaper_ahmedabad.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/watch_the_handmaids_tale_season_2_episode_9_online_free.pdfIn PDF document text
    • http://sozunonu.epizy.com/dampak_merokok_bagi_kesehatan.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/mitosis_vs_meiosis_cstephenmurray_answers.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_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 5196 bytes
SHA-256: 42349f2a7d6d03e8973a500ae52617e63835219f9384e72afdbc6bf8dc6e941a
font_01_sfnt_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 10452 bytes
SHA-256: eb2f0539230c498973bb2d65c3903970de92319ef62eea4a11f6f67ae1613f32