Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b8edcfe486e643…

MALICIOUS

PDF

101.4 KB Created: 2021-05-07 01:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a50de9ecc171d87f025c017f51dec4b1 SHA-1: 81ad8b397c6a49aa658ed2ea9d0428442e05c305 SHA-256: c9b8edcfe486e643429ebf1723cba8b238993337d3ccf673a3e857b145d35880
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one prominent URL pointing to a suspicious domain ('mezovuduw.ru') that is likely used to host a phishing page or a second-stage payload. The document body, though heavily obfuscated, suggests a lure related to topographical drawings, which is a common tactic for disguising malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://mezovuduw.ru/strik?utm_term=que+es+un+dibujo+topografico PDF link annotation
    • http://alternativeinfluencenetwork.net/15105638974klcfe.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/66895619163.pdfIn PDF document text
    • https://lumusoma.weebly.com/uploads/1/3/4/8/134896253/pudomekepefukiva.pdfIn PDF document text
    • http://bighome.space/cisco_asa_5510_cli_commandsxw90p.pdfIn PDF document text
    • https://pawiwojofidinof.weebly.com/uploads/1/3/4/4/134458390/nizelagaxenadax_ralofemuz.pdfIn PDF document text
    • http://zathkatow.xyz/9114707055sdg2b.pdfIn PDF document text
    • https://gibonubud.weebly.com/uploads/1/3/4/8/134877094/semebewenunif.pdfIn PDF document text
    • http://1eyvgo.xyz/mortal_kombat_deception_ps2_isoozgt0.pdfIn PDF document text
    • https://mebifexet.weebly.com/uploads/1/3/1/3/131381374/nirakerevavevuzuz.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/021dfb.pdfIn PDF document text
    • https://gupakejaxigi.weebly.com/uploads/1/3/4/5/134581176/gimumuri.pdfIn PDF document text
    • https://ximipozatapemo.weebly.com/uploads/1/3/5/2/135297631/ruvasupowaxod.pdfIn PDF document text
    • http://plusstore.pro/dulofunagominezaxobanro4h4.pdfIn PDF document text
    • http://wemorewabadeluz.mygamesonline.org/personification_worksheets_grade_3.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/kaxemeserotobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/62156455521.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/consort_diagram_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415d0503-d537-4ae9-98fc-3abbec65afaa/garirazawozejakaw.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/kozatimox.pdfIn PDF document text
    • http://mivurukelino.onlinewebshop.net/spatial_visualization_reasoning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/002514ae-f0af-433a-acc2-a4b3af8e0cc7/psychiatric_mental_health_nursing_10th_edition_test_bank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caed1dfe-9995-441d-a233-97b19e46735a/mimeverozivovutufejetuzuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e703ab-24e0-4ebe-baa8-26b2b60123a7/2478587423.pdfIn 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_off00014bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD0 5568 bytes
SHA-256: f43acf4061f5da5f8bd4364e98e2bedb3c29e46700faf9ab7c6710913f79fdf2
font_01_sfnt_off00015ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECD 12144 bytes
SHA-256: 60da1e5f6435012d76456ce5f31ddaee2d7848df6db024ec3bb239638e46424a