Malicious PDF — malware analysis report

Static analysis result for SHA-256 22db025e4a84db76…

MALICIOUS

PDF

73.9 KB Created: 2021-09-12 20:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ce52db16b6aba407b454ac305ec627db SHA-1: 8ec2228f0c6a992b88aff7ee76c3c752ff0694f4 SHA-256: 22db025e4a84db76d4be6294312492524a448d115e468b1987d666877849cdbc
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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 http://dreamscar.eu/userfiles/file/49973629812.pdf In PDF document text
    • http://stfurnimart.com/file_media/file_image/file/rurijaxupejokisamedizul.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/vasowugukidumugobexewu.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/borezupevakuro.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/89404835024.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/46579906290.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/dofokidojetixik.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/68539808823.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/mexavikunibanizowuzubo.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/xifodotoxamupa.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/6519756211.pdfIn PDF document text
    • http://ore-processing.ru/d/files/nemux.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/30968138043.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/zetuxe.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/jasebadazukepubagapu.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/jh4b5424dmf2rdoao3rm2gorvf/melijizi.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/6551862345.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/10522217434.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/mujizidiziponopozid.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109060317005552.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/womufebunugob.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351f75d2f9b---84316653736.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/62951163096.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/88052612864.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210911_153759_127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bein+sport+free+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC9 16820 bytes
SHA-256: cf5ec85874599fbfd84ecc84cae2afac7e860a41ba985e5e1ef809860601a4ca
font_01_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 10452 bytes
SHA-256: e4e383aa6d9aac5c580da3b0c6a7f3ada4db015b32e4f01f8114e8339bed37e5