Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf849a25b41e978…

MALICIOUS

PDF

108.6 KB Created: 2021-05-15 22:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7f522db8d7aa572c27bbe9d25f334576 SHA-1: ed7667aa4746ea640f5e8ac7c1bc2ea1977243fb SHA-256: 2bf849a25b41e9787bc7255b8d7add50f81f7315464b43be46ee3788f1e07c34
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external links indicate an attempt to lead the user to a malicious second-stage resource.

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://maypoin.ru/strik?utm_term=cbt+activities+for+youth+anxiety PDF link annotation
    • https://cdn.sqhk.co/noneniwetav/gjgbgih/download_game_banana_kong_mod.pdfIn PDF document text
    • http://bisituz.sportsontheweb.net/vapivuwani.pdfIn PDF document text
    • https://ximesadi.weebly.com/uploads/1/3/0/9/130969353/a11f4c809c5.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/what_is_the_default_ip_address_for_arris_router.pdfIn PDF document text
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/pupora-ribadimumazaw.pdfIn PDF document text
    • https://rorujazikuje.weebly.com/uploads/1/3/1/3/131379225/loxibiruvabus.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/air_cooler_project_report_download.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/21538594233.pdfIn PDF document text
    • http://vawevubigawuti.22web.org/arthritis_uk_shoulder_exercise.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/jihfXca/kodewedamuv.pdfIn PDF document text
    • http://mofirixubutibi.getenjoyment.net/berib.pdfIn PDF document text
    • https://sidonakitipu.weebly.com/uploads/1/3/4/6/134631457/f75649ea.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/proposal_skripsi_akuntansi_manajemen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_79db4935ba8b48879f19e3d5b4ee61dc.pdf?index=trueIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_bac045ffddb848b69a11d92c4a97bc99.pdf?index=trueIn PDF document text
    • http://tejusadesivuti.epizy.com/will_eisner_comics_and_sequential_art.pdfIn PDF document text
    • http://sivetidezu.epizy.com/74210109688.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_ea9e72f3ff2a4588b265fa51ad94019e.pdf?index=trueIn PDF document text
    • http://muluwokixo.onlinewebshop.net/how_to_make_fios_remote_control_tv.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/33237845680.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/25124288362.pdfIn PDF document text
    • https://0a3880f2-9bda-4900-b484-73a003b8a878.filesusr.com/ugd/3cbe5d_62be2000a5ab407f980bd1bfe15dc7f4.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_off00016d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D19 5212 bytes
SHA-256: 8e7472a30a12090284e5235f7373367ce4f95634f6b5d682e921df5521d163c8
font_01_sfnt_off00017ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EE1 11428 bytes
SHA-256: 93477bd7220332ca5115f4e5a5dc2c2f67f8cb46f74ccdc0eec00d0c0ed285fb