Malicious PDF — malware analysis report

Static analysis result for SHA-256 02560e25c7b49a79…

MALICIOUS

PDF

80.0 KB Created: 2021-03-17 13:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c57a0386daf11a373f221ab895e23090 SHA-1: 55b6ec590a5739d507dfd8d1b85ac48e5f1af5f7 SHA-256: 02560e25c7b49a7920cfb6965b2627552dfe041ac6cc5ebaa70715e05c51632d
186 Risk Score

Malware Insights

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

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 0.9993

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://crophysi.ru/123?utm_term=salisbury+cathedral+school+uniform PDF link annotation
    • https://cdn.sqhk.co/mofisozulud/hedjcgh/28635707685.pdfIn PDF document text
    • https://xufuluzigi.weebly.com/uploads/1/3/4/2/134266078/tujaliloxan-vogovofefekim-wawolikabe-tonogere.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/OQRif70/gokojejame.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/ehfjjVt/drifty_chase_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/jd1FSjh/32347025578.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/3iajhet/dome_of_doom_game_download.pdfIn PDF document text
    • https://somubafe.weebly.com/uploads/1/3/4/4/134444697/kijor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384836/normal_600550ec416e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_601e5c26c10c5.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/027a7cde81f0.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/2667108.pdfIn PDF document text
    • https://tumalurezap.weebly.com/uploads/1/3/2/6/132696080/nujibokunoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409799/normal_6048e5e869b61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_aadd28a564844b57904cf9facf78c62b.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_9346fb5d0bd949de8a0ae7eaa841e0dc.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_4b2f03fa12a24b0389dcd52f483b5f6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minabiwa/musica_cristiana_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/fovuw.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_81f81719f1da43519f804ece0fdb37aa.pdf?index=trueIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_c2a5948ec76546d69eecd7d57e75ba4b.pdf?index=trueIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_38cd47b3f39b4883993781b485c82f33.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_ec9e7f4f67ed4b0d9658bc968074005b.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_d0dba9de20dd4541bea6a0b10fb55035.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_d82b2d330f5d476aa50dc30d0969ed56.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_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 5604 bytes
SHA-256: 021e7fa3939e9888d14b1345837778e7e189fac7f1f1b49ed9f7bbd2a258fa25
font_01_sfnt_off00010b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 11576 bytes
SHA-256: a25af636a5d0b3f08155ddae9fb45f8ef16ca33e0583ec7ef8c879ed504a3afa