Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea71b192dc54301…

MALICIOUS

PDF

76.1 KB Created: 2021-05-09 14:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 62cbab39fd0fefb4e0f2eedbd2673f4d SHA-1: 74a02e63e6846e98facc19e5147454c85088d055 SHA-256: 4ea71b192dc54301ee888a2dcda6faa3ea41a2a47c93651e5a32e6148238ca68
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with a high ML classifier score and ClamAV detection. It contains numerous external links, many pointing to disposable hosting, suggesting a phishing or SEO spam campaign. Although no scripts were extracted, the presence of many external URIs indicates an attempt to redirect the user to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=cant+stop+wont+stop+nyx+concealer+shades PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481985/normal_601e7221839c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_602a79936d7e6.pdfIn PDF document text
    • https://jotovaxawunujej.weebly.com/uploads/1/3/1/8/131856347/6210566.pdfIn PDF document text
    • https://wenojuzak.weebly.com/uploads/1/3/4/2/134265903/dorivuneluxe-toxugimaxoz-dowopikimi.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/hdhecLT/89750764454.pdfIn PDF document text
    • https://bonavipopugob.weebly.com/uploads/1/3/2/3/132302892/7937852.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/qgiiapu/cookie_clicker_hack_code_on_ipad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446027/normal_604cdb11121da.pdfIn PDF document text
    • https://gigiwejube.weebly.com/uploads/1/3/5/9/135984489/nuwasosusixoxi-fisumowudobudi-gudiwumise-pedirak.pdfIn PDF document text
    • http://watewuwij.22web.org/nios_assignment_front_page_free.pdfIn PDF document text
    • https://xugowumilivave.weebly.com/uploads/1/3/4/8/134846580/vagipejojij.pdfIn PDF document text
    • https://cdn.sqhk.co/kanemili/hjijd3d/33355866505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d9dfa1-44be-475e-a9ea-e516b9083e67/13012561574.pdfIn PDF document text
    • http://pegalepumatadur.rf.gd/minimalismo_anticrisis_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f009bbe-2cfd-42e3-b3c1-63cd5a0a891d/realtek_audio_drivers_update_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5d380c-ef52-4feb-8346-eafac30f73d7/how_to_write_calligraphy_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d82fc44-03fb-4656-b778-23c6c80d87f0/jisomofojiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9407b352-e2d5-4d07-9857-09b7bdfd1616/41386276409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2669bdfd-ba2c-4cf3-afe8-f504ffb32b21/43718996772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f51113a-59d1-457b-b401-098a9be27216/nutunolaragapemidutevit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/219919aa-29a3-4a81-a130-b50888e395bb/22228918767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d93d31-8466-4275-b978-233a74c09289/janekovaroxomip.pdfIn PDF document text
    • http://zidojupilazado.rf.gd/christian_dance_songs_in_tamil.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_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 5328 bytes
SHA-256: 7db3e8df077bfc942a018fd79c44e67c7de50efa1fcf4112e016208c6fa6ffa4
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 11516 bytes
SHA-256: 8dc2f16c2e12431e1da8936997a8cd0127db08d62eb5b228155f6dcadf042bce