Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0dce9609072888…

MALICIOUS

PDF

91.9 KB Created: 2021-03-16 00:32:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1f656abec52e25e77e5124e099b9a706 SHA-1: a6b5d52e0831ee14d3cdaac8c893ee70571ac8a2 SHA-256: db0dce9609072888c21bc2f2306fd4696b90c8cd956f42f45642322e8ba24f6b
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://gimoguvi.ru/123?utm_term=envato+after+effects+free+templates PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410002/normal_60205b057960c.pdfIn PDF document text
    • http://my-favshop.online/zamabu3drjx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447271/normal_6032cffb227a1.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/pyramid_principle_barbara_minto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450426/normal_5fedc2e1ca4d4.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/Aiijabp/video_player_pro_apk_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501208/normal_5fcf8ced54752.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/jjE4OKr/vezevivuda.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/deresomoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462354/normal_60188565db69d.pdfIn PDF document text
    • https://cdn.sqhk.co/kenujowemi/jcjahhh/mamunoxop.pdfIn PDF document text
    • http://xazupadapafow.mypressonline.com/adding_and_subtracting_decimals_worksheets_5th_grade.pdfIn PDF document text
    • http://vajukadezazi.getenjoyment.net/lozizuxibarutu.pdfIn PDF document text
    • http://wunuvuzixuxi.getenjoyment.net/aromaticity_practice_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/gjc2gcD/13315449032.pdfIn PDF document text
    • http://oficialshoes.site/diduvuujcgl.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/tepedupikuwikixosenu.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/cissp_book_shon_harris.pdfIn PDF document text
    • http://callup.today/11_minutos_descargar_libro_gratisr3i90.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/how_to_set_up_home_theater_with_projector.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzomowa/Zgciegd/pivotuv.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/general_anesthesia_for_cesarean_section.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xuvuzonixo.onlinewebshop.net/shimano_dura_ace_9150_di2_adjustment.pdfIn PDF document text
    • http://zilowovuv.atwebpages.com/biomes_of_north_america_pogil_answers.pdfIn PDF document text
    • http://wugerubuvugox.myartsonline.com/can_you_play_game_of_life_online_with_friends.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/58668775721.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 4920 bytes
SHA-256: 4f87ecfb85050988fc9d021b24878bf6934004cbe7913c60ee14f6c0695ad45e
font_01_sfnt_off00012eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB2 10928 bytes
SHA-256: 2b80b3d4c3014f84420d45f9814df4da55e4971ab106c16cab2a69193fcb562c
font_02_sfnt_off00015401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15401 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378