Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52ed742e07ed717…

MALICIOUS

PDF

84.7 KB Created: 2021-04-18 18:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d595606ed71676dcd9f1b871cf5cd40 SHA-1: e2e9e920980adcb6b6d14aef1261e284ff055488 SHA-256: b52ed742e07ed7170e428a63707487147471e38a65c044f5cfa4b82cd899c7be
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs are likely used to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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 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/strik?utm_term=what+is+the+coldest+place+on+the+planet
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/3828382.pdf
    • https://cdn.sqhk.co/bipokagiti/f9JhcSi/kodusabi.pdf
    • https://bubefotuline.weebly.com/uploads/1/3/1/4/131438432/1621733.pdf
    • https://wilegefozuf.weebly.com/uploads/1/3/4/3/134399327/mibopuliwuruto.pdf
    • https://rabiwibunefa.weebly.com/uploads/1/3/4/7/134747284/8d36fd65.pdf
    • https://cdn.sqhk.co/kisasizaro/fieyQjg/samsung_galaxy_watch_active_2_health_features.pdf
    • http://fegokodelaxen.scienceontheweb.net/descargar_agenda_2020_gratis.pdf
    • http://zowogusatutojus.mywebcommunity.org/39106148880.pdf
    • http://larebalin.mypressonline.com/wizojo.pdf
    • http://mukuwasoveta.sportsontheweb.net/78230027613.pdf
    • http://sowipilarow.mygamesonline.org/what_is_descartes_second_meditation.pdf
    • http://pigigozoruda.mypressonline.com/8808775120.pdf
    • http://xofelivigavas.mywebcommunity.org/48674623719.pdf
    • http://ribadubeko.scienceontheweb.net/aggregation_and_composition_in_c.pdf
    • https://cdn.sqhk.co/wazikunal/cnjhVQY/99817434129.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_cf96cf2b21e5493794036d399d498cb7.pdf?index=true
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_6b02d0a7cfd647ac94222aaa65271b4a.pdf?index=true
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_4f8f6afdd12a40d6b77bff639635df31.pdf?index=true
    • http://biwosagamivi.myartsonline.com/japofogasumazaw.pdf
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_f00742a81970491cb533f414c7beb1e3.pdf?index=true
    • http://jasunusemoki.onlinewebshop.net/zapixapodenopezizasiwona.pdf
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_4626d24f994e47c089fba9a236c257fd.pdf?index=true
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_88a8063235974089818d07a86b514ccf.pdf?index=true
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_38a3beb9959642f8a6036b249d893484.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100aa.bin
777f6485006fd0d63b036d4d5a9c80a506737ab750e71cdebb1051cf93b50a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 4864 bytes
font_01_sfnt_off0001112f.bin
d7d2d2fd94e67cae75c4ab27c4cd67c283ee546bf08581181c96b95c1a7a5466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 11216 bytes
font_02_sfnt_off000136ec.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136EC 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.