Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44f31c8efb572a0…

MALICIOUS

PDF

82.8 KB Created: 2021-03-15 06:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d31ae0213bb2da4a7ba4fe90e2543a53 SHA-1: 7eb9bafc484ddb76f3785ccdecc154b43708aa02 SHA-256: b44f31c8efb572a073af85319468b8b4e4af7f892939c353c8866b06c10caa26
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting, indicating a link farm strategy. The primary external URL observed is https://kuzutuzo.ru/wix?keyword=cable+one+biloxi+tv+guide, suggesting a lure to a potentially malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://kuzutuzo.ru/wix?keyword=cable+one+biloxi+tv+guide PDF link annotation
    • https://cdn.sqhk.co/nexoratuxi/ajjvvUR/pinkfong_tracing_world_full_apk.pdfIn PDF document text
    • http://mujubow.getenjoyment.net/office_furniture_design_catalogue.pdfIn PDF document text
    • https://tediresul.weebly.com/uploads/1/3/5/3/135345321/5860308.pdfIn PDF document text
    • https://mirebaxowani.weebly.com/uploads/1/3/4/0/134017623/logidasi.pdfIn PDF document text
    • https://wizejuxexena.weebly.com/uploads/1/3/4/6/134655833/886215.pdfIn PDF document text
    • https://rarerosedipise.weebly.com/uploads/1/3/4/8/134876587/8539005.pdfIn PDF document text
    • https://cdn.sqhk.co/zesuxetirano/cRLgegc/jasumiwi.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/definicion_de_estilos_de_vida_saludable_segun_la_oms.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/didagozubujadosifugawez.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/iepB4gh/i_remember_you_kdrama_cast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/farezelof/smoke_effect_action_photoshop_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1cb00b-205e-4945-a27d-59086b6784af/lenguaje_del_cuerpo_alexander_lowen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6faf4437-bde0-4fa4-9e47-1635250b30f1/anytone_at-5888uv_iii.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/bupukab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbda3595-f7ba-441c-9c82-ba41d0c8699e/how_to_replace_pull_cord_on_echo_blower.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/brittainy_c._cherry_livros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf270add-c0f3-4da5-82cc-b1433e3aee5c/what_laptop_can_run_adobe_premiere.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/beauty_and_the_beast_piano_sheet_music_ariana_grande.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37affee8-184c-4fdf-8acc-a873bb5db5d5/do_doctors_make_house_calls_in_bc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e21494-6bb8-465f-951b-ea2c5c8d5192/the_chaser_movie_online_with_english_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/zibedetofip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a020850a-fc9c-4214-aefd-6e4ff57381ea/estructura_interna_y_externa_de_los_textos_informativos.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/30831611466.pdfIn PDF document text
    • http://pujumek.myartsonline.com/divemog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6aabbfb-5d48-4ef7-8c5d-cb0721e5ea43/how_to_use_mini_keurig_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04579ec3-03b3-488a-918c-7cce539ca7b9/90486904652.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_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 4892 bytes
SHA-256: ce0f1e2574c7cc52e2d7bce45e3e16eba2a127b84166328774f5599672665673
font_01_sfnt_off00011732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11732 11480 bytes
SHA-256: aa5383e7c3baad0ec313e680f2385967396fe3d272cc3dcb1b61b5b5a058f72b