Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c539b57d8b83a2e…

MALICIOUS

PDF

78.8 KB Created: 2021-06-08 20:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5c8d87cf2b8dc4c3b4359a8cb26b4a19 SHA-1: d2c80c791c954e14a3f4d151ba072748a9040765 SHA-256: 0c539b57d8b83a2ec3256e7720a1be376ea5d9c83b4e3725b8f6e73c203b70e4
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://gimoguvi.ru/123?utm_term=baby+shoe+size+guide+canada PDF link annotation
    • https://pebizadovabunal.weebly.com/uploads/1/3/4/7/134711288/3354765.pdfIn PDF document text
    • https://vamewifajezik.weebly.com/uploads/1/3/5/2/135297159/defelafa_mikagutawalo.pdfIn PDF document text
    • https://guxiwuwo.weebly.com/uploads/1/3/1/0/131070036/8063919.pdfIn PDF document text
    • https://bonizilolalov.weebly.com/uploads/1/3/4/4/134458774/1389459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_60ba7f8b5f11e.pdfIn PDF document text
    • https://morekakenug.weebly.com/uploads/1/3/5/3/135335539/sakozori-ruviziralena-pulokoxuvefur.pdfIn PDF document text
    • https://geguromivakof.weebly.com/uploads/1/3/4/3/134332909/5620624.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/dubizepazidukaz.pdfIn PDF document text
    • https://kolojadulosa.weebly.com/uploads/1/3/1/3/131397946/xuloporadovulanagusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471995/normal_600b47c8b4f27.pdfIn PDF document text
    • https://poxusesemeli.weebly.com/uploads/1/3/4/4/134462398/zevevo-basawe-wegirudi-tiner.pdfIn PDF document text
    • https://mosodufenu.weebly.com/uploads/1/3/4/8/134889918/cc313fb712b56.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/xuxomin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_6026582812d44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144485349/gemefasedirive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7e494e-14e2-40dc-92d4-a3ff83716f1f/blue_is_the_warmest_color_watch_online_123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59fba989-9593-4a04-9971-95c75adc80cb/vijimimitiseziv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee1509b-3dc2-470e-b915-4e41080da8b3/how_do_i_reset_my_kitchenaid_superba_oven.pdfIn PDF document text
    • http://bilabegape.pbworks.com/f/weluvepemuwubemiravoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7cad7e9-40ae-4833-885b-120e27ed45d5/57582373262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2add429-74ce-431a-84fd-334c9e9b6e40/examen_tipo_enlace_historia_de_mexico_secundaria.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_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 5412 bytes
SHA-256: 497f4cd0192d6ea207586af3746f9cb719a81370a9f0e105485a52a75a603d34
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 10576 bytes
SHA-256: d7aaf158eb4e444b58756ff4d59980b199dd58d8e74e9cbc9a48223b7520df76