Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ba02e2227e93bf…

MALICIOUS

PDF

72.5 KB Created: 2021-03-31 06:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ca6c4ec090a455af50ecaf81b1a911ec SHA-1: b2ee125695744f2e3d9191a4b7e7be26cb550b6a SHA-256: 52ba02e2227e93bf470a5787c9b5051d1028708adf518de1a04c070922df7e76
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the link farm heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=misal+romano+tercera+edici%25C3%25B3n+m%25C3%25A9xico+pdf PDF link annotation
    • http://websporizle3.com/samsung_smart_switch_mobile_ios_downloadac5fr.pdfIn PDF document text
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/faganudoraw.pdfIn PDF document text
    • https://sebuvijanamo.weebly.com/uploads/1/3/4/8/134856810/fuwabonoritit-metizubafadekap-mikonorerile-fotidaveli.pdfIn PDF document text
    • https://bovusobovazova.weebly.com/uploads/1/3/4/5/134596491/1596069.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://mebotus.mypressonline.com/acrobat_editor_free_download_with_crack.pdfIn PDF document text
    • https://jojeditisiteso.weebly.com/uploads/1/3/1/6/131606373/nadewubofebuda-potegor-dejunumiwex-vebum.pdfIn PDF document text
    • https://razisosip.weebly.com/uploads/1/3/0/7/130739291/tivitezozasaw-pobupama-kaneteden.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/hhfgcib/52125073269.pdfIn PDF document text
    • https://kawuwulaf.weebly.com/uploads/1/3/3/9/133987507/duvajutibagunafiwub.pdfIn PDF document text
    • http://buloshnaya.site/959988499589i25.pdfIn PDF document text
    • https://gusoberususot.weebly.com/uploads/1/3/1/4/131454899/a70ea033130.pdfIn PDF document text
    • http://mmmmmme.space/unilorin_admission_list_download_2018jzxjx.pdfIn PDF document text
    • https://gegadibiliwo.weebly.com/uploads/1/3/1/8/131871883/fezidokozon.pdfIn PDF document text
    • https://cdn.sqhk.co/wozovege/3Gjgdlo/best_electric_vegetable_chopper_and_slicer.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/agriculture_university_admission_circular_2020_20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_b4941d2d0004412a8b596b4c7897ed56.pdf?index=trueIn PDF document text
    • http://litabasiker.onlinewebshop.net/architectural_design_with_sketchup_free_download.pdfIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_1d4e0ef2e8384748a1229fb79aef277b.pdf?index=trueIn PDF document text
    • http://bavatesivo.myartsonline.com/68816932206.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_74cf7a35e40340ec94412f06843b1e23.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_d15ffce5d44e4aa5959b8718baaccc11.pdf?index=trueIn PDF document text
    • http://fanalejowegop.atwebpages.com/wing_chun_hand_techniques.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_83b2818b39a8465b894888fd1c4944fe.pdf?index=trueIn 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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 5652 bytes
SHA-256: 15b84b1ddd2d03add484a9df83c44d6b05ae8962bc5393f78744f28bb96f7a5d
font_01_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 11244 bytes
SHA-256: 0d37d60a4d16c03e85a57e07bee90f5a5228554a4ea3f711cd097023f3ec221c